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Posted: 11/23/2015 1:28:28 PM EDT
[#1]
I would just take it to a gunsmith (this is coming from a guy who DIY'ed an M4 barrel into a disipator using a hand drill and a bucket).
I had a similar problem (same barrel as mentioned above, actually). The bolt would close on a live round, but not on a go gauge. I had an actual competent gunsmith ream the chamber, and it is all good now. ETA: Quoted: My question is this, should I just do this 50 - 100 times and maybe it will loosen up itself or should i get the thing lathed down at a gunsmith? |
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Posted: 11/23/2015 1:33:17 PM EDT
[#2]
Does it not close on all of the new BCGs or just one of them?
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Posted: 11/23/2015 2:18:23 PM EDT
[#3]
Quote HistoryQuoted:
Does it not close on all of the new BCGs or just one of them? Tested on both of the new Chrome DD bolts and an old anodized one with 500-1000 rounds on it. Wouldn't pass on any of them. |
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Posted: 11/23/2015 2:19:44 PM EDT
[#4]
Upfront, I'm pretty new to the AR.
If it's only a couple thenths and you don't want to buy a reamer, could you fix a empty casing, or chamber mop to a shaft and use some lapping compound around the neck? Either with a drill or hand lap? Just a thought. |
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Posted: 11/23/2015 3:28:06 PM EDT
[#5]
Send it back.
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Posted: 11/23/2015 5:41:05 PM EDT
[#6]
Quote HistoryQuoted:
Upfront, I'm pretty new to the AR. If it's only a couple thenths and you don't want to buy a reamer, could you fix a empty casing, or chamber mop to a shaft and use some lapping compound around the neck? Either with a drill or hand lap? Just a thought. LOL I am planning on taking gunsmithing courses, but I don't know the first thing about reaming a barrel, so i'm gonna go ahead and not do that. :) I was hoping the tolerance was just tight and maybe it was just a burr or something. I didn't want to pay $100 (or whatever it will cost) for something I can do myself. |
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Posted: 11/23/2015 7:42:27 PM EDT
[#7]
Quoted:
<SNIP> I called the manufacturer and they had not heard from anyone having a headspace issue with their barrels before and said that their tolerances can definitely be tight at times depending on the bolt. If i can fix it myself, I would prefer that. Let me know the options I have. Thanks all. Considering many in good faith (misplaced in this case) don't think you have to headspace an AR barrel, I would say that is why they haven't heard of this problem before. The part in red is key, how they admitted to you that it could be too tight and out of spec. Send it back. |
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Posted: 11/23/2015 8:05:19 PM EDT
[#8]
Quote HistoryQuoted:
Send it back. THIS. If a barrel won't allow several bolts to close on a GO gauge, it is not properly chambered. End of question. Send it back with an explanation of how you tested it. NEVER, NEVER, NEVER use anything but LIGHT finger pressure when checking headspace. If very light finger pressure isn't enough to get the bolt to close, the bolt isn't closing. |
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Posted: 11/23/2015 9:14:45 PM EDT
[#9]
Quote HistoryQuoted:
LOL I am planning on taking gunsmithing courses, but I don't know the first thing about reaming a barrel, so i'm gonna go ahead and not do that. :) I was hoping the tolerance was just tight and maybe it was just a burr or something. I didn't want to pay $100 (or whatever it will cost) for something I can do myself. Haha. Fair. Call me reckless. Just out of curiosity, Is it chrome lined? I guess this puts me in the send it back camp. |
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Posted: 11/23/2015 9:42:53 PM EDT
[#10]
Did you remove the extractor when you check the headspace?
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Posted: 11/23/2015 10:13:23 PM EDT
[#11]
[youtube]https://youtu.be/fVJo2i3hyvE[/youtube]
http://www.reamerrentals.com/SearchResults.asp?Cat=439 http://www.midwayusa.com/product/771941/ptg-solid-pilot-chamber-finish-reamer-300-aac-blackout |
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Posted: 11/23/2015 11:53:43 PM EDT
[#12]
Quote HistoryQuoted:
Haha. Fair. Call me reckless. Just out of curiosity, Is it chrome lined? I guess this puts me in the send it back camp. Quote HistoryQuoted:
Quoted:
LOL I am planning on taking gunsmithing courses, but I don't know the first thing about reaming a barrel, so i'm gonna go ahead and not do that. :) I was hoping the tolerance was just tight and maybe it was just a burr or something. I didn't want to pay $100 (or whatever it will cost) for something I can do myself. Haha. Fair. Call me reckless. Just out of curiosity, Is it chrome lined? I guess this puts me in the send it back camp. If it isn't in spec, send it back. I just sent one back with a canted sight. Messing with it will likely void your ability to send it back |
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Posted: 11/24/2015 5:23:20 AM EDT
[#13]
Quoted:My question is this, should I just do this 50 - 100 times and maybe it will loosen up itself . . . It will probably ruin the headspace gage . . . |
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Posted: 11/24/2015 6:45:12 AM EDT
[#14]
Quote HistoryQuoted:
I was hoping the tolerance was just tight You keep using that word incorrectly. |
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Posted: 11/24/2015 10:20:37 AM EDT
[#15]
If a bolt that is .153” from the bolt face to the rear side of the lugs will not close on the Go gage the barrel is short on headspace.
Do not force the gages. |
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Posted: 11/24/2015 10:29:28 AM EDT
[#16]
Right now we are living in the Golden Age of ARs. This won't last long. Why screw around with a crap barrel when you can just buy one that is good right out of the box?
Send it back and buy one from a reputable vendor and be done with it. |
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Posted: 11/25/2015 1:04:48 AM EDT
[#17]
Quote HistoryQuoted: I would just take it to a gunsmith (this is coming from a guy who DIY'ed an M4 barrel into a disipator using a hand drill and a bucket). I had a similar problem (same barrel as mentioned above, actually). The bolt would close on a live round, but not on a go gauge. I had an actual competent gunsmith ream the chamber, and it is all good now. ETA: A bolt and barrel that loosen up chamber dimensions after 50-100 cycles is probably not made of metal that you would want to send live rounds through in the first place. Quote HistoryQuoted: I would just take it to a gunsmith (this is coming from a guy who DIY'ed an M4 barrel into a disipator using a hand drill and a bucket). I had a similar problem (same barrel as mentioned above, actually). The bolt would close on a live round, but not on a go gauge. I had an actual competent gunsmith ream the chamber, and it is all good now. ETA: Quoted: My question is this, should I just do this 50 - 100 times and maybe it will loosen up itself or should i get the thing lathed down at a gunsmith? I would talk with manufacturer. |
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Posted: 11/25/2015 1:23:19 AM EDT
[#18]
Why people put shit together and then check the headspace is beyond stupid. You should take your new barrel and your striped bolt and insert the go gauge and check it before you install the barrel. You can turn the striped bolt with your fingers and tell if its good or not and not jack up your headspace gauge.
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Posted: 11/25/2015 2:12:48 AM EDT
[#19]
Excessive headspace creates a dangerous condition. A bit tight, on the other hand, isn't an issue so long as the bolt will fully close.
Personally, I'd probably just go shoot the thing, see how it does (making sure, of course, that the bolt was fully closed each time for awhile). The high spots on the lug engagement surfaces will wear in. I've put together a couple that were real snug, to the point that you could let the bolt go and chamber a round, but extracting it required a tap on the CH with a mini deadblow or small piece of wood. Guess what? After a mag or two, they smoothed right out, was able to easily hand cycle rounds. |
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Posted: 11/25/2015 9:20:08 AM EDT
[#20]
Send it back
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Posted: 11/25/2015 9:29:36 PM EDT
[#21]
Quote HistoryQuoted:
Excessive headspace creates a dangerous condition. A bit tight, on the other hand, isn't an issue so long as the bolt will fully close. Personally, I'd probably just go shoot the thing, see how it does (making sure, of course, that the bolt was fully closed each time for awhile). The high spots on the lug engagement surfaces will wear in. I've put together a couple that were real snug, to the point that you could let the bolt go and chamber a round, but extracting it required a tap on the CH with a mini deadblow or small piece of wood. Guess what? After a mag or two, they smoothed right out, was able to easily hand cycle rounds. Not closing on a GO gauge isn't "a bit tight." And any effort beyond LIGHT finger pressure to close the bolt is TOO MUCH. That's how headspace gauges work. If you're forcing things, you may as well not use the gauge. |
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Posted: 11/25/2015 10:57:37 PM EDT
[#22]
As many have said, if the gauge does not close with normal light pressure than your barrel is not head spaced properly. You need to remove extractor with the PTG gauge.
You can try another bolt just to be certain it is your barrel that is out of spec. I checked REV Arms web site and they claim to be sub-MOA barrels and the price is no bargain. Contact them and let them make it right or refund your money. Why fix a new part? To fix this right you need a chamber finish reamer. |
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Posted: 11/28/2015 1:08:58 AM EDT
[#23]
Chamber and cartridge specs are set so maximum tolerance rounds will safely function in minimum tolerance chambers and vice versa.
If your headspace is short or long you are setting yourself up for function issues. Maybe not a big deal at the range, but in a HD or hunting situation it could have unintended consequences. |
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Posted: 11/28/2015 9:26:55 AM EDT
[#24]
Just to be sure you are using a 300blk gauge and not the 223/556 right?
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Posted: 11/28/2015 3:04:07 PM EDT
[#25]
Quote HistoryQuoted:
Right now we are living in the Golden Age of ARs. This won't last long. Why screw around with a crap barrel when you can just buy one that is good right out of the box? Send it back and buy one from a reputable vendor and be done with it. This makes sense. |
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Posted: 11/28/2015 3:06:57 PM EDT
[#26]
Quote HistoryQuoted:
Excessive headspace creates a dangerous condition. A bit tight, on the other hand, isn't an issue so long as the bolt will fully close. Personally, I'd probably just go shoot the thing, see how it does (making sure, of course, that the bolt was fully closed each time for awhile). The high spots on the lug engagement surfaces will wear in. I've put together a couple that were real snug, to the point that you could let the bolt go and chamber a round, but extracting it required a tap on the CH with a mini deadblow or small piece of wood. Guess what? After a mag or two, they smoothed right out, was able to easily hand cycle rounds. Glad it worked for you but for others it may just become a rifle that fails to chamber or extract reliably. YMMV. |
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