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Posted: 7/21/2013 9:01:36 AM EDT
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So, I've put together two AR15s, both using Blackthorne Products parts kits, one on a Surplus Arms and Ammo lower and the other on a Stag Arms lower. Both came with uppers totally assembled and the lowers were assembled by myself under the supervision of my friend who's a gunsmith.
Here's the issue. AR15 #2 has had a big issue with chambering and ejecting ammunition. As soon as I figured this out, I sent back the upper to have the chamber resized by Blackthorne Products. $50 in shipping, three weeks, and two screwups from UPS later, I have my upper back. Before, it wouldn't chamber anything at all. When I got it back, it chambered my .223 MFS zinc ammo decently (mind you, this rifle is chambered in 5.56). I had a bunch of reloads I had picked up, but I figured what the hell, I'll just shoot those out of AR15 #1 and keep going with the zinc-plated steel and nicer brass when I got it. Then I got some nicer brass ammo. 63gr 5.56 Radway Green AP and some M855. I had chambered these rounds previously and had no issues with the 'not firing' but chambering. I go to the range yesterday and got off three rounds of green tip in AR15 #2 before it failed to shoot and failed to eject. The round was all the way in the chamber and I pretty much had to wait until I got home so I could use my cleaning rod to pop the round out. At this point, I'm not sure if it's the chamber or something else. I've taken my rifle apart numerous times and haven't found any issues. Same with my gunsmith buddy. I would have guessed it's the ammo before I got some legitimate ammo. Any thoughts would be appreciated. If it is the chamber, is there any way to widen it without buying the chamber reamer? How much would a gunsmith charge to do that? Thanks. tl;dr nice ammo isn't ejecting from an AR15. Also, pay the extra $100 and get something better that's not from Blackthorne. |
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"They" recut your chamber... Bells are ringing. Check your headspace, chamber dimensions, and then consider replacing that barrel. That other issue, failing to eject, is presumably a by-product of failing to fire.  But seriously, if they reamed the fuck out of your chamber then it's possible the extractor isn't snapping over the rim.
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Your description leaves a lot to be desired.
Are you saying with the bolt closed the extractor is not engaging the cartridge rim? At this point it could be anything from a bad extractor to grossly excessive headspace. What do you mean by all the way into the chamber? Presumably the round was stuck in the chamber if you had to knock it out. I totally agree with tumbleweed about checking headspace and chamber dimensions. Also what do you mean by widen the chamber? |
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Quoted:
I'm just not seeing a chamber cleaning fixing this turd.  Quoted:
Quoted:
Not trying to be a jack ass here but have you scrubbed it with a chamber brush? I'm just not seeing a chamber cleaning fixing this turd. Yeah I'd steer clear of Blackthorne but from the OP's description of the barrel when it was first received it could be just a cleaning issue. I have seen more than my fair share of feeding/extraction/ejection issues due to not scrubbing the chamber on a new barrel. Scrub it and run it wet. |
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Hey guys, thanks for all the advice. Work has been holding me down 80+ hours a week so I haven't had much time to mess around with that piece of crap.
So, to answer some questions. 1. By widen, I meant ream or use a reamer or whatever technical term. 2. I have not tried a chamber brush. I have thought of it but have not had the chance to try. 3. I haven't measured/checked headspace. I appreciate the tip. Also, I'm not sure I mentioned this earlier: I can chamber and eject rounds when not firing the weapon (except the crap reloads I have). Not sure if that lends more insight. Thanks again! |
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You cannot ream/recut the chamber yourself. This is a job for a gunsmith or barrelsmith.
You cannot fix a headspace problem yourself. This would require replacing the barrel extension, indexing and drilling a new pin in the barrel extension afterward. This would aso require the services of a gunsmith or a barrelsmith. If you buy a set of Go and NO GO gauges, you could check the barrel and maybe determine if the services of a gunsmith or barrelsmith are required to fix the problem, BEFORE giving up and buying a new barrel. |
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You can ream a chamber; there are a variety of reamers available.
Someone even makes one to clean up a chamber to 556 specs without affecting headspace. Doing this without knowing what you are doing is a really bad idea. Since it would appear your ‘gunsmith’ buddy does not know what to do find someone that does like ADCO. You could easily spend more money than that barrel is worth and still have problems. |
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