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evlblkwpnz
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Posted: 1/17/2012 8:14:18 AM
[Last Edit: 2/18/2012 12:11:01 PM by evlblkwpnz]
ETA: Clarity. I have removed my graphs because I feel that InfiniteGrim's processing of the results is far superior.

I would like to thank all of you who have shown interest in and offered support. There were some times during this where I wanted to just give up. You helped us see it through.

I would like to thank Peengwin, Felton, archad, Pavlovwolf, and InfiniteGrim for their contributions here. I would like to also thank Aimless for letting this train roll out until we reached the end of our testing. They all absolutely deserve credit here as I did not do this on my own, far from it. I'm just a stubborn guy who wanted to be a part of getting to the bottom of this or at least scraping the top of what the truth might be. I think we merely shed some light into the black hole of wonder that surrounds these barrels. If anyone else would like to do their own testing and have it linked in this post, after review, I will most certainly consider it and post them if they appear legitimate. I welcome any further independent testing.

To make it a little easier, I have linked to InfiniteGrim's posts on page 21 for those that might want to see the targets and processed results without wading through 20 pages to find them. InfiniteGrim spent 3 hours on this, so please appreciate.

.... the targets

.... the processed results


In a nutshell, I feel it is fairly safe to say that these barrels, and probably any other FN manufactured CHF barrels, are reasonably similar in performance. However, with Spike's and PSA's recent rise in price, I think many might feel a little better about spending a few more $ for the Centurion, BCM, or Noveske. The choice to go with a Noveske would be fairly obvious (proprietary profile, brand recognition, and reputation). The choice to go with Centurion would be a geared more toward a few different things (Monty is active military.... NAVY SEAL!, has an excellent reputation, and some people like for things to match and he offers sights, rails, and some other items for the AR platform). The choice to go with BCM is really obvious (excellent reputation and Paul has an extremely loyal following).

Spike's has a pretty hardcore fan base here too, so many may be fine with the increase in price. PSA is gaining some momentum here as far as fans go, in spite of some of the issues that they were having a while back, but many may be more inclined to get the Spike's for a few more bucks. However, I was impressed with how well the 12.5" PSA shot. I bought it for use on a host upper and it is apparently a keeper.

They are all winners, IMO. Pick a rollmark and price point.
I am a slave to my creations.... my image cannot be seen in them, but they bear my heart and soul - evl....
9divdoc
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Posted: 1/17/2012 9:52:36 AM
[Last Edit: 2/17/2012 8:56:34 AM by 9divdoc]
Nice work guy

Very informative
Grant me the senility to forget the people I never liked anyway,
the good fortune to run into the ones I do,
and the eyesight to tell the difference.
comp1911
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Posted: 1/17/2012 10:15:54 AM
In.

Makes sense to me.
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Glock031
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Posted: 1/17/2012 10:41:05 AM
Thank you for your contribution!
wolverine05
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Posted: 1/17/2012 10:47:09 AM
Originally Posted By evlblkwpnz:
"OP" does not "admit" claims in other thread are inaccurate. Not sure where the system got that, but my speculation in the original post of the other thread was confirmed 100% accurate.

Other than length, some of the profiles, some of the crowns, and some of the gas port sizes, ALL of the FN manufactured CHF barrel blanks used to produce barrels for 5 different companies ARE INDEED THE SAME. Some of the barrels even share the exact same exterior machining specs, aside from rollmarking, of course.

ALL of the blanks come from the same material, go through the same testing, get the same chrome lining, receive the same finish, and are held to the same standards. The finished barrels come from the same inventory. If you do not believe it, suit yourself and do your own research. The testing is pointless, but I am going to do it anyway to attempt to satisfy the "hard data" crowd here even though they will say that I need to fire 50,000 rounds through each barrel, have a sample lot of 500 barrels from each company, and test them in all of the extreme temperatures/conditions that one might find on planet Earth I am going to spend my time and money doing this, so please keep your antagonistic comments to yourself and have a little respect for the fact that I am going to go well out of my way to contribute what YOU have asked for. If you do not trust my testing, buy barrels from the 3 companies, as I have, and do your own testing. I own/co-own 3 businesses (none are in the firearms industry), so spare time is very hard to come by, but I will likely do the testing on the last weekend of this month or the first couple of weeks in February. I would prefer to wait until I have an optic on a QD mount that is better suited to target shooting. Please understand my position and please exhibit some patience. Let's try wearing our "big boy" pants....

ANYONE who would like to come to SE GA to contribute to, film, video, or personally witness this testing, please IM me.


How can you support that your claim is 100% accurate? What is your source of this information? If you are going to make such a claim, you should back it up with sources. That is all anyone is asking for.
wrc777
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Posted: 1/17/2012 10:47:56 AM
Originally Posted By 9divdoc:
I was under the impression(perhaps erroneously?), that there are two different "grades" of barrels involved....

FN standard M4 type barrels and M249 "Machine Gun Barrels" ...aka "double chrome lined"

You are only going to test those barrels that are claimed to come from M249 cold hammer forged blanks and have "double chrome" lining correct?

thank you for your efforts to clarify various manufacturers claims



FN makes a button rifled M16 barrel for the military. I assume they would also sell barrels with this process if someone wanted to buy them. I think the buyer would have to provide specs for the profile and length to avoid issues with TDP.

Rumor is that the MP/HPT non CHF barrels Palmetto is buying are FN button rifled barrels. I have not seen that admitted by PSA though.
wrc777
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Posted: 1/17/2012 10:52:31 AM
Originally Posted By wolverine05:
Originally Posted By evlblkwpnz:
"OP" does not "admit" claims in other thread are inaccurate. Not sure where the system got that, but my speculation in the original post of the other thread was confirmed 100% accurate.

Other than length, some of the profiles, some of the crowns, and some of the gas port sizes, ALL of the FN manufactured CHF barrel blanks used to produce barrels for 5 different companies ARE INDEED THE SAME. Some of the barrels even share the exact same exterior machining specs, aside from rollmarking, of course.

ALL of the blanks come from the same material, go through the same testing, get the same chrome lining, receive the same finish, and are held to the same standards. The finished barrels come from the same inventory. If you do not believe it, suit yourself and do your own research. The testing is pointless, but I am going to do it anyway to attempt to satisfy the "hard data" crowd here even though they will say that I need to fire 50,000 rounds through each barrel, have a sample lot of 500 barrels from each company, and test them in all of the extreme temperatures/conditions that one might find on planet Earth I am going to spend my time and money doing this, so please keep your antagonistic comments to yourself and have a little respect for the fact that I am going to go well out of my way to contribute what YOU have asked for. If you do not trust my testing, buy barrels from the 3 companies, as I have, and do your own testing. I own/co-own 3 businesses (none are in the firearms industry), so spare time is very hard to come by, but I will likely do the testing on the last weekend of this month or the first couple of weeks in February. I would prefer to wait until I have an optic on a QD mount that is better suited to target shooting. Please understand my position and please exhibit some patience. Let's try wearing our "big boy" pants....

ANYONE who would like to come to SE GA to contribute to, film, video, or personally witness this testing, please IM me.


How can you support that your claim is 100% accurate? What is your source of this information? If you are going to make such a claim, you should back it up with sources. That is all anyone is asking for.


Who has a source saying the barrels are different?
wolverine05
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Posted: 1/17/2012 11:03:22 AM
Originally Posted By wrc777:
Originally Posted By wolverine05:
Originally Posted By evlblkwpnz:
"OP" does not "admit" claims in other thread are inaccurate. Not sure where the system got that, but my speculation in the original post of the other thread was confirmed 100% accurate.

Other than length, some of the profiles, some of the crowns, and some of the gas port sizes, ALL of the FN manufactured CHF barrel blanks used to produce barrels for 5 different companies ARE INDEED THE SAME. Some of the barrels even share the exact same exterior machining specs, aside from rollmarking, of course.

ALL of the blanks come from the same material, go through the same testing, get the same chrome lining, receive the same finish, and are held to the same standards. The finished barrels come from the same inventory. If you do not believe it, suit yourself and do your own research. The testing is pointless, but I am going to do it anyway to attempt to satisfy the "hard data" crowd here even though they will say that I need to fire 50,000 rounds through each barrel, have a sample lot of 500 barrels from each company, and test them in all of the extreme temperatures/conditions that one might find on planet Earth I am going to spend my time and money doing this, so please keep your antagonistic comments to yourself and have a little respect for the fact that I am going to go well out of my way to contribute what YOU have asked for. If you do not trust my testing, buy barrels from the 3 companies, as I have, and do your own testing. I own/co-own 3 businesses (none are in the firearms industry), so spare time is very hard to come by, but I will likely do the testing on the last weekend of this month or the first couple of weeks in February. I would prefer to wait until I have an optic on a QD mount that is better suited to target shooting. Please understand my position and please exhibit some patience. Let's try wearing our "big boy" pants....

ANYONE who would like to come to SE GA to contribute to, film, video, or personally witness this testing, please IM me.


How can you support that your claim is 100% accurate? What is your source of this information? If you are going to make such a claim, you should back it up with sources. That is all anyone is asking for.


Who has a source saying the barrels are different?


Come on, use your head. He's the one making the claim, so he needs to provide the support.

Sometimes you need to think before you post.

thornejc
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Posted: 1/17/2012 11:11:28 AM
[Last Edit: 1/17/2012 11:13:43 AM by thornejc]
My friend works out at FN manufacturing and all of their CHF barrel blanks are produced by the same process and with the same materials regardless of who they are made for (with the exception of blanks produced for the M249). PSA is located in Columbia, SC with FN so it is possible that they got a better deal because they are local.
Yojimbo
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Posted: 1/17/2012 11:14:31 AM
So, do all the FN double lined, CHF barrels also have the tapered bore or is this only done for Centurion?


Also, how much variance was there in gas port sizes?

I for one appreciate your efforts to bring this informtion to light. I look forward to seeing your shooting results.
Kilroytheknifesnob
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Posted: 1/17/2012 11:55:58 AM
Oh yes, the butthurt will be strong in this thread. I'm thinking that all FN barrels are going to end up being very similar, whatever name is on it is irrelevant. What's the scheduled date for this test?

The real issue here is that people are intensely emotionally invested in their expensive brands. For a company like PSA to sell a basically identical product challenges their decision to pay a premium for something else. People don't like to pay extra just for the brand name, they try to find any differences (parked under FSB) and pretend like those are worth the extra money they paid. Just face it, expensive brands charge more for the name, not necessarily because they have better products.
ColdBlood
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Posted: 1/17/2012 12:09:25 PM
Originally Posted By evlblkwpnz:
"OP" does not "admit" claims in other thread are inaccurate. Not sure where the system got that, but my speculation in the original post of the other thread was confirmed 100% accurate.

Other than length, some of the profiles, some of the crowns, and some of the gas port sizes, ALL of the FN manufactured CHF barrel blanks used to produce barrels for 5 different companies ARE INDEED THE SAME. Some of the barrels even share the exact same exterior machining specs, aside from rollmarking, of course.

ALL of the blanks come from the same material, go through the same testing, get the same chrome lining, receive the same finish, and are held to the same standards. The finished barrels come from the same inventory. If you do not believe it, suit yourself and do your own research. The testing is pointless, but I am going to do it anyway to attempt to satisfy the "hard data" crowd here even though they will say that I need to fire 50,000 rounds through each barrel, have a sample lot of 500 barrels from each company, and test them in all of the extreme temperatures/conditions that one might find on planet Earth I am going to spend my time and money doing this, so please keep your antagonistic comments to yourself and have a little respect for the fact that I am going to go well out of my way to contribute what YOU have asked for. If you do not trust my testing, buy barrels from the 3 companies, as I have, and do your own testing. I own/co-own 3 businesses (none are in the firearms industry), so spare time is very hard to come by, but I will likely do the testing on the last weekend of this month or the first couple of weeks in February. I would prefer to wait until I have an optic on a QD mount that is better suited to target shooting. Please understand my position and please exhibit some patience. Let's try wearing our "big boy" pants....

ANYONE who would like to come to SE GA to contribute to, film, video, or personally witness this testing, please IM me.


The profile, crown and gas port sizes contribute significantly to the function of the rifle. Having said that, have you considered what similarities that really leaves you with?

From what I can surmise, that means they're made from the same type of steel, have the same chamber/rifling and they undergo the same process for chrome lining.

It seems to me like the differences could very well be more crucial than whatever it is that remains the same

Noveske's stainless barrels are manufactured on Pac-Nor's machines using Pac-Nor's blanks, but when you compare them to the ones Pac-Nor sells, you'll see it's a good example of how a rifle maker's "recipe" (specs) can make fairly substantial differences in how the barrel actually performs.

I'm not trying to pee in your cornflakes or keep you from doing your test...I'm just trying to understand your definition of "the same" and also understand the real point of testing one barrel from each manufacturer.

I can't help but think that if PSA loses, PSA fans will say the test was inconclusive (not a big enough sample size)...if it outperforms the others, then we'll have legions of PSA fanboys proclaiming their barrels are better than a Noveske/Centurion/whatever.
rgerh
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Posted: 1/17/2012 12:11:59 PM
Originally Posted By Kilroytheknifesnob:
Oh yes, the butthurt will be strong in this thread. I'm thinking that all FN barrels are going to end up being very similar, whatever name is on it is irrelevant. What's the scheduled date for this test?

The real issue here is that people are intensely emotionally invested in their expensive brands. For a company like PSA to sell a basically identical product challenges their decision to pay a premium for something else. People don't like to pay extra just for the brand name, they try to find any differences (parked under FSB) and pretend like those are worth the extra money they paid. Just face it, expensive brands charge more for the name, not necessarily because they have better products.


You hit the nail on the head on this post Kilroytheknifesnob, I agree 100% but that does not mean my butt don't hurt a bit. Kinda sad on a couple of things I purchased
Kikken
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Posted: 1/17/2012 12:20:40 PM
[Last Edit: 1/17/2012 12:21:19 PM by Kikken]
Originally Posted By ColdBlood:
I can't help but think that if PSA loses, PSA fans will say the test was inconclusive (not a big enough sample size)...if it outperforms the others, then we'll have legions of PSA fanboys proclaiming their barrels are better than a Noveske/Centurion/whatever.


Yeah, but that goes both ways. If the test shows similar accuracy, then the $$$ fans will say a sample size of one means nothing.

The bottom line is that someone is putting his money where his mouth is and doing the test, and that is great news. Maybe some more people will too, and then the sample size increases.
Yojimbo
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Posted: 1/17/2012 12:32:52 PM
[Last Edit: 1/17/2012 1:00:49 PM by Yojimbo]
Personally, it doesn't matter to me if the PSA barrel proves to be as accurate as the Noveske or Centurion barrels or not.

If the PSA can prove relaible and shoot about 2 MOA I would still consider it good to go for a quality FN CHF barrel for use on a fighting gun. It would hard to go wrong any FN manufactured barrel, especially at that price range.
RobNC
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Posted: 1/17/2012 12:40:41 PM
I really don't have a dog in this fight but I think some of the comments that have been posted in this and the other thread are ridiculous and deny common sense. I'm going to lay out some facts that I think we can all agree on and then make some conclusions based on simple economics.

Fact: FN makes cold hammer forge barrels from M249 blanks for Noveske, Centurion Arms, and PSA.
Fact: FN is an ISO compliant company and Government Contractor. The barrel steel must meet basic TDP requirements for the M249 SAW and be certified before it arrives in the factory.
Fact: The specific manufacturers can make different design specifications to their barrels, ie gas ports, crowns, and profiles, but the basic steel used is the same.
Fact: Shipping heavy items, such as barrels, is extremely expensive. Shipping costs are passed on to the consumer through higher retail prices.
Fact: PSA is located about 15 minutes from the FN plant and has no need to have barrels shipped. Local pick up is possible. Shipping costs are either eliminated or greatly reduced due to geographic location.
Fact: PSA FN/CHF barrels are less expensive, are made from the same blanks, but may have different profiles, gas ports, and crowns than the Noveske or Centurion Arms.

Conclusion: PSA FN/CHF barrels are made from the same blanks and are cheaper for the consumer because of the (however much) reduced cost of shipping the product from the factory to the retailer. We don't know if the gas ports are the same size because no one has measured them yet (OP?). The "tapered bore" of the Centurion might be an added feature that costs more, Noveske and PSA don't mention it. The PSA "light weight" and Noveske "skinny profile" appear to be identical from the pics on both companies web sites.

Noveske has been around and has a proven track record of putting out top end rifles assembled by people that know what they are doing. Centurion Arms is relatively new but the owner, Monty, brings his own credibility and I haven't read one negative review. PSA has just started distributing FN parts under their label, but has had some assembly issues and other growing pains. The owner is quick to respond and their customer service appears to be good to go.

It would be great if PSA would post up the specs to their FN barrels, such as gp size and crown info. It would be even better if they identified their source for LPKs, bolts, and bolt carriers. If they come from FN great, if not no big deal. Noveske used/uses CMT parts.

Just my contribution. Thanks OP for doing the testing.

Rob

ColdBlood
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Posted: 1/17/2012 12:46:53 PM
Originally Posted By Yojimbo:
Personally, I doesn't matter to me if the PSA barrel proves to be as accurate as the Noveske or Centurion barrels or not.

If the PSA can prove to to relaible and shoot about 2 MOA I would still consider it good to go for a quality FN CHF barrel for use on a fighting gun. It would hard to wrong any FN manufactured barrel, especially at that price nlrange.


Oh hell...I bet it's capable better than 2 MOA (assuming all other variables are out of the equation). Being made from the same materials by FN, I don't think there's any question as to whether it's a quality barrel. My point is that you can't discount the fact that there are other differences with the Noveske (not sure about Centurion).
comp1911
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Posted: 1/17/2012 12:53:39 PM
Originally Posted By RobNC:
I really don't have a dog in this fight but I think some of the comments that have been posted in this and the other thread are ridiculous and deny common sense. I'm going to lay out some facts that I think we can all agree on and then make some conclusions based on simple economics.

Fact: FN makes cold hammer forge barrels from M249 blanks for Noveske, Centurion Arms, and PSA.
Fact: FN is an ISO compliant company and Government Contractor. The barrel steel must meet basic TDP requirements for the M249 SAW and be certified before it arrives in the factory.
Fact: The specific manufacturers can make different design specifications to their barrels, ie gas ports, crowns, and profiles, but the basic steel used is the same.
Fact: Shipping heavy items, such as barrels, is extremely expensive. Shipping costs are passed on to the consumer through higher retail prices.
Fact: PSA is located about 15 minutes from the FN plant and has no need to have barrels shipped. Local pick up is possible. Shipping costs are either eliminated or greatly reduced due to geographic location.
Fact: PSA FN/CHF barrels are less expensive, are made from the same blanks, but may have different profiles, gas ports, and crowns than the Noveske or Centurion Arms.

Conclusion: PSA FN/CHF barrels are made from the same blanks and are cheaper for the consumer because of the (however much) reduced cost of shipping the product from the factory to the retailer. We don't know if the gas ports are the same size because no one has measured them yet (OP?). The "tapered bore" of the Centurion might be an added feature that costs more, Noveske and PSA don't mention it. The PSA "light weight" and Noveske "skinny profile" appear to be identical from the pics on both companies web sites.

Noveske has been around and has a proven track record of putting out top end rifles assembled by people that know what they are doing. Centurion Arms is relatively new but the owner, Monty, brings his own credibility and I haven't read one negative review. PSA has just started distributing FN parts under their label, but has had some assembly issues and other growing pains. The owner is quick to respond and their customer service appears to be good to go.

It would be great if PSA would post up the specs to their FN barrels, such as gp size and crown info. It would be even better if they identified their source for LPKs, bolts, and bolt carriers. If they come from FN great, if not no big deal. Noveske used/uses CMT parts.

Just my contribution. Thanks OP for doing the testing.

Rob



Nice post.
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sinlessorrow
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Posted: 1/17/2012 1:11:17 PM
Tagged, this will be very interesting and the butthurt will flow

Thank you op for doin thus, i wish i had to money to do testig like this
dmvfr
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Posted: 1/17/2012 1:13:45 PM
nice to see someone actually step up to the plate and do a test of the CHF FN barrels instead of arguing that there is no way in hell "gasp" a PSA FN barrel be able to match a Nov/Cent barrel. ,
thanks and look forward to your results
evlblkwpnz
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Posted: 1/17/2012 2:37:41 PM
If is makes any of you feel better, I will be first in line to be butt hurt. I have purchased 1 Centurion Arms 11.5" LW barrel and 2 Noveske 10.5" N4 barrels in the past year. Most if which have been purchased within the last 2 months and I would have considered PSA had I known what thier barrels really start as. Crowns and profile are things that I can get past. I have no problem enlarging ports if that is what I need to do in order to achieve the reliability that I expect from a weapon. I am not new to modifying and working on weapons.

I am at work and will be posting again tonight. I have a few questions pertaining to testing methods, equipment, and what data needs to be recorded to make this as thorough and proper as possible.

I am a slave to my creations.... my image cannot be seen in them, but they bear my heart and soul - evl....
buckjay
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Posted: 1/17/2012 3:27:36 PM
If you're going to do all this testing (which I, along with many others, are very appreciative of) then you gotta get your hands on a chronograph as well as it would be a shame to not be able to get the velocity while you do all this testing.
9divdoc
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Posted: 1/17/2012 3:49:07 PM
Originally Posted By RobNC:
I really don't have a dog in this fight but I think some of the comments that have been posted in this and the other thread are ridiculous and deny common sense. I'm going to lay out some facts that I think we can all agree on and then make some conclusions based on simple economics.

Fact: FN makes cold hammer forge barrels from M249 blanks for Noveske, Centurion Arms, and PSA.
Fact: FN is an ISO compliant company and Government Contractor. The barrel steel must meet basic TDP requirements for the M249 SAW and be certified before it arrives in the factory.
Fact: The specific manufacturers can make different design specifications to their barrels, ie gas ports, crowns, and profiles, but the basic steel used is the same.
Fact: Shipping heavy items, such as barrels, is extremely expensive. Shipping costs are passed on to the consumer through higher retail prices.
Fact: PSA is located about 15 minutes from the FN plant and has no need to have barrels shipped. Local pick up is possible. Shipping costs are either eliminated or greatly reduced due to geographic location.
Fact: PSA FN/CHF barrels are less expensive, are made from the same blanks, but may have different profiles, gas ports, and crowns than the Noveske or Centurion Arms.

Conclusion: PSA FN/CHF barrels are made from the same blanks and are cheaper for the consumer because of the (however much) reduced cost of shipping the product from the factory to the retailer. We don't know if the gas ports are the same size because no one has measured them yet (OP?). The "tapered bore" of the Centurion might be an added feature that costs more, Noveske and PSA don't mention it. The PSA "light weight" and Noveske "skinny profile" appear to be identical from the pics on both companies web sites.

Noveske has been around and has a proven track record of putting out top end rifles assembled by people that know what they are doing. Centurion Arms is relatively new but the owner, Monty, brings his own credibility and I haven't read one negative review. PSA has just started distributing FN parts under their label, but has had some assembly issues and other growing pains. The owner is quick to respond and their customer service appears to be good to go.

It would be great if PSA would post up the specs to their FN barrels, such as gp size and crown info. It would be even better if they identified their source for LPKs, bolts, and bolt carriers. If they come from FN great, if not no big deal. Noveske used/uses CMT parts.

Just my contribution. Thanks OP for doing the testing.

Rob



Thanks for this post

Does FN make any CHF barrels available for purchase by private individuals that are not made from M249 blanks?

tia
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the good fortune to run into the ones I do,
and the eyesight to tell the difference.
WI57
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Posted: 1/17/2012 4:13:11 PM
In for the results and videos.

Good luck!
Its not the guy that walks in with a gun and says he is going to start shooting that you have to worry about.
Its the guy that just walks in and just starts shooting.
Peengwin
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Posted: 1/17/2012 4:27:19 PM
Originally Posted By buckjay:
If you're going to do all this testing (which I, along with many others, are very appreciative of) then you gotta get your hands on a chronograph as well as it would be a shame to not be able to get the velocity while you do all this testing.


I may be able to scrounge one up.
This is not a signature. You didn't see anything.
pavlovwolf
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Posted: 1/17/2012 5:30:28 PM
I would suggest that you put them all in a solid rest such as a lead sled to eliminate as much human error as possible.
Still, one barrel may like some or all of the ammo better than the other barrels. I still say the only way to truly determine the accuracy potential for each rifle for a true comparison would be to work up several loads of several weights for each barrel, and test them on the same day, under the same conditions. Even two barrels from the same company that are exactly the same specs that come off of the assembly line back to back can be different, and often are. You may have one that shoots 75gr well, and the other not, but will shoot 69gr well. Even two different brands of the same grain may differ as much as 2 or 3 moa.

For instance.
My AR Performance 6.8. My 90TNT load is 29.8 gr of Re7 and a COAL of 2.295 inches. 2925fps It shoots 5 shots at 100 yards of .420
The same load with the difference being a COAL of 2.28 shoots into 1.2 inches at 100 yards Velocity is 2935fps
The same load with the only difference being 29.0 gr of powder, shoots 5 shots at 100 of 2.5 inches,
The 29.0gr load with a COAL of 2.28 shoots into a group of 1.5 moa,

Personally, if you have the time, I would work up an accurate load with a 55gr, a mid weight bullet, and a 75 or 77gr for each barrel. Test best loads against best loads for each barrel from the same bench on the same day, same conditions, and with the same shot sequence ( timing, cool down etc). After that, you should include the popular ammo, surplus etc for each.

One other thing is to use 10 shot groups. 3 means nothing. 5 is ok for working up loads, but 10 will really show where you stand.

I would like to thank you for what you're doing.
Don't go ninj'in nobody that don't need ninj'in
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