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Posted: 2/3/2016 10:52:47 PM EDT
I'm kicking around the idea of building a 14.5" SBR with a dimpled barrel. Looking for a good source for one.
Oh and I'm looking for something that is 1/7 twist, 5.56 chamber, carbine gas, chrome or melonite lined, and made from 41V50 steel. This is what I mean by dimpled. 
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Posted: 2/3/2016 11:06:55 PM EDT
[#1]
BCM
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Posted: 2/3/2016 11:17:40 PM EDT
[#2]
You talking about gas block dimples?
Dimple spacing varies with gas block manufacturer, so a pre-dimpled barrel limits your choice of blocks. You can buy a simple dimple jig here, not too expensive and it works well. http://slrrifleworks.com/index.php?route=product/search&filter_name=jig Although it's primarily designed for 0.400 and 0.450 spacing, you can easily use it to create any spaced pair of dimples. |
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Posted: 2/3/2016 11:31:51 PM EDT
[#3]
Whatever barrel you want and send it to Marvin Pitts. I think a Colt SOCOM barrel would be a good candidate.
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Posted: 2/4/2016 12:16:38 AM EDT
[#4]
Just so we are clear, I'm talking about an entirely dimpled barrel.
Quote HistoryQuoted:
Whatever barrel you want and send it to Marvin Pitts. I think a Colt SOCOM barrel would be a good candidate. I thought about that, but the grenade launcher cuts ruin the look. |
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Posted: 2/4/2016 12:49:29 AM EDT
[#5]
Get the barrel you want and send it to Marvin Pitts at Nefarious Arms. He is the only person licensed to use the Knights Armament pattern dimples you have pictured in the original post. Another person that works closely with Marvin and may have the barrel you described would be Ayan over at BoltCarrier.com. The only thing is that I do not think he's using a carbine length gas system and is toying around with something similar to the KAC gas length.
I'll try and dig up the thread he has in the Knights sub-forum posting info about them. |
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Posted: 2/4/2016 1:18:34 AM EDT
[#6]
Yeah I've been eyeing a Knights barrel, but was curious what else is out there, and I'd prefer carbine on a 14.5".
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Posted: 2/4/2016 1:24:42 AM EDT
[#7]
Quote HistoryQuoted:
Just so we are clear, I'm talking about an entirely dimpled barrel. I thought about that, but the grenade launcher cuts ruin the look. Quote HistoryQuoted:
Just so we are clear, I'm talking about an entirely dimpled barrel. Quoted:
Whatever barrel you want and send it to Marvin Pitts. I think a Colt SOCOM barrel would be a good candidate. I thought about that, but the grenade launcher cuts ruin the look. You could try to find a 16" version as those don't have the cuts. ***not the giant rear cut, at least. That one would obviously have to be cut down as well. |
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Posted: 2/4/2016 1:27:43 AM EDT
[#8]
Send it to ADCO
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Posted: 2/4/2016 1:35:14 AM EDT
[#9]
Nobody else does dimples from the factory except KAC (now discontinued). Buy the barrel you want and send it to Marvin Pitts.
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Posted: 2/4/2016 1:53:03 AM EDT
[#10]
Here is an example of Marvins work. He's done many Noveske barrels like this for me. Love my 14.5 dimpled Afghan.
It was hard to let this one go. |
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Posted: 2/4/2016 3:58:10 AM EDT
[#11]
Quote HistoryQuoted:
Here is an example of Marvins work. He's done many Noveske barrels like this for me. Love my 14.5 dimpled Afghan. It was hard to let this one go. That's a work of art right there! I've got a spare Noveske barrel laying around, definitely will send it to Marvin sometime down the road. |
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Posted: 2/4/2016 8:55:12 AM EDT
[#12]
Quote HistoryQuoted:
Here is an example of Marvins work. He's done many Noveske barrels like this for me. Love my 14.5 dimpled Afghan. It was hard to let this one go. Yeah, that's exactly what I'm thinking of. That is a real beauty. Thanks for the advice folks. |
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Posted: 2/4/2016 11:50:44 AM EDT
[#13]
You know what you want to do.
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Posted: 2/4/2016 1:01:16 PM EDT
[#14]
You can't see much of it here, but Marvin did the barrel on my Recce. I'm very happy with it.
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Posted: 2/4/2016 2:00:11 PM EDT
[#15]
What kind of price would someone be looking at for a Marvin Pitts dimple job on a DD 11.5", roughly?
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Posted: 2/4/2016 2:42:01 PM EDT
[#16]
Is this primarily a cooling issue or is it more cosmetic? I saw a guy at the range last month who's barrel was not dimpled but "threaded" which I'm guessing achieves a similar purpose?
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Posted: 2/4/2016 2:50:10 PM EDT
[#17]
I did it for weight reduction.
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Posted: 2/5/2016 12:26:03 PM EDT
[#18]
Quote HistoryQuoted:
What kind of price would someone be looking at for a Marvin Pitts dimple job on a DD 11.5", roughly? $150 behind the gas block, $45 in front. |
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Posted: 2/5/2016 12:34:52 PM EDT
[#19]
Quote HistoryQuoted:
$150 behind the gas block, $45 in front. Quote HistoryQuoted:
Quoted:
What kind of price would someone be looking at for a Marvin Pitts dimple job on a DD 11.5", roughly? $150 behind the gas block, $45 in front. That's not too bad. |
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Posted: 2/5/2016 1:27:49 PM EDT
[#20]
Quote HistoryQuoted:
That's not too bad. Quote HistoryQuoted:
Quoted:
Quoted:
What kind of price would someone be looking at for a Marvin Pitts dimple job on a DD 11.5", roughly? $150 behind the gas block, $45 in front. That's not too bad. FYI, that is just for an 11.5" barrel, longer barrels are more expensive. |
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Posted: 2/5/2016 1:44:52 PM EDT
[#21]
For those interested I have made some models comparing dimpling, fluting, and re-profiling. Dimpling removes the least weight and re-profiling removes the most.
This is a picture comparing three 10" SOCOM diameter barrels I modeled so they would all have the same mass. The dimpled barrel had the smallest minimum diameter (.570"), followed by the fluted (.664"), and then finally the re-profiled barrel (.770"). The dimpled barrel had the most surface area of the three. A 16" barrel would have approximately twice as much difference. I do not know the exact measurements any company uses to dimple or flute their barrels, I simply used a .250" ball end mill and spaced them based on the pictures I have seen. Most likely they won't remove as much weight as I did, this was only for comparison. The dimpling does look the best IMO. Based on cost and how much weight I wanted to lose, I chose to re-profile my barrels. 
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Posted: 2/5/2016 1:55:02 PM EDT
[#22]
For reference, here's a few of the before/after dimpling jobs on some of the Noveske stainless steel barrels I've had Marvin dimple. I chose to keep the medium profile and dimple vs fluting or reprofiling. Reprofiling really changes the characteristics of the barrel and I didn't want that for these particular barrels. I would be very interested in seeing scientific before/after deflection and accuracy testing using the various methods.
Noveske 5.56 10.5 SS CQB Stripped BEFORE - 23.2oz Noveske 5.56 10.5 SS CQB Stripped AFTER - 18.8oz DECREASE OF 4.4oz Noveske 5.56 14.5 SS Afghan Stripped BEFORE - 31.2oz Noveske 5.56 14.5 SS Afghan Stripped AFTER - 25.2oz DECREASE of 6.0oz Noveske 7.62 16 SS AR10 Stripped BEFORE - 38.8oz Noveske 7.62 16 SS AR10 Stripped AFTER - 32.9oz DECREASE of 5.9oz |
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Posted: 2/5/2016 2:12:28 PM EDT
[#23]
Quote HistoryQuoted:
FYI, that is just for an 11.5" barrel, longer barrels are more expensive. Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
What kind of price would someone be looking at for a Marvin Pitts dimple job on a DD 11.5", roughly? $150 behind the gas block, $45 in front. That's not too bad. FYI, that is just for an 11.5" barrel, longer barrels are more expensive. I figured. So that means you're probably somewhere around $300 to dimple a 14.5" barrel? |
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Posted: 2/5/2016 2:34:13 PM EDT
[#24]
Quote HistoryQuoted:
I figured. So that means you're probably somewhere around $300 to dimple a 14.5" barrel? Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
Quoted:
What kind of price would someone be looking at for a Marvin Pitts dimple job on a DD 11.5", roughly? $150 behind the gas block, $45 in front. That's not too bad. FYI, that is just for an 11.5" barrel, longer barrels are more expensive. I figured. So that means you're probably somewhere around $300 to dimple a 14.5" barrel? The $45 charge changes to a $75 charge at that length. Also, these don't include refinishing either AFAIK. From Nefarious Arms that is $55 for Parkerizing, $95 for Cerakote. |
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Posted: 2/5/2016 3:10:15 PM EDT
[#25]
Quote HistoryQuoted: For those interested I have made some models comparing dimpling, fluting, and re-profiling. Dimpling removes the least weight and re-profiling removes the most. This is a picture comparing three 10" SOCOM diameter barrels I modeled so they would all have the same mass. The dimpled barrel had the smallest minimum diameter (.570"), followed by the fluted (.664"), and then finally the re-profiled barrel (.770"). The dimpled barrel had the most surface area of the three. A 16" barrel would have approximately twice as much difference. I do not know the exact measurements any company uses to dimple or flute their barrels, I simply used a .250" ball end mill and spaced them based on the pictures I have seen. Most likely they won't remove as much weight as I did, this was only for comparison. The dimpling does look the best IMO. Based on cost and how much weight I wanted to lose, I chose to re-profile my barrels. http://i279.photobucket.com/albums/kk148/pezboytate/Firearms/DIMPLED%20AND%20FLUTED%20BARRELS.png Nice job. It looks to me like fluting is still the best value. |
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Posted: 2/7/2016 12:43:32 PM EDT
[#26]
Quote HistoryQuoted:
..... I would be very interested in seeing scientific before/after deflection and accuracy testing using the various methods. ........ I'm curious about this as well. Wonder if Molon has done tests on these? |
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Posted: 2/7/2016 7:33:08 PM EDT
[#27]
Marvin did two for me
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Posted: 2/7/2016 7:46:05 PM EDT
[#28]
That second one looks similar to what I'm going for. Only with a Geissele rail and a muzzle device that works with a halo.
Well done. |
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Posted: 2/8/2016 12:19:57 PM EDT
[#29]
I updated my models to more closely reflect the amount of weight loss Brahmzy reported. I used a .3125" ball end mill and this time I put the total external surface area from the front of the extension to the back of the muzzle threads on the drawing along with the minimum diameter.
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