In all my years of shooting AR-15's I have never had this happen before. Seen it once and heard of it but never on one of my guns even after the beatings I give them. Even the Colt RO635 that I broke a couple charging handles beating it open with a hammer this has never happened. Happened between round 660-692. Guess the company that made the upper just couldn't afford that extra .20 cents on the proper bolts.
I hate soft screws
- Thread starter 338lapua
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The pornographic setup in the Subject line is just too easy. Mindful of the admonition regarding waterfowl at rest on the water's surface, I'll let this one pass.
Suck My Glock
Member
I read the title and all I could think of was,...
That's what she said!
That's what she said!
OK, now that we have sexually harassed you, tell us -- who was the company who made the cheap-a** part?
I don't know who made it, gun store owner said they make a lot of PCC parts like this though. No markings on it. He just handed me a new carrier. He had not seen one do this either. Only purpose of that part is when pulling the charging handle, just no clue how it sheared off like that. It is under no stress during firing. I know when I first got it the bolt carrier was hitting on the buffer tube or the buffer retainer but it stopped doing that. Just put the new one in and it did not have the issue hitting the buffer tube or retainer while pulling the charging handle back. I believe it is a New Frontier Armory part as the one here looks exactly like it.
https://www.newfrontierarmory.com/shop/ar-9-standard-9mm-bcg-glock-colt-and-mp5-compatible/
https://www.newfrontierarmory.com/shop/ar-9-standard-9mm-bcg-glock-colt-and-mp5-compatible/
Steve_In_29
Member
Actually there is stress involved during firing. That part is separate from the bolt and thus there is inertia involved that the two screws need to deal with to keep it attached.338lapua said:
While I obviously have no way of knowing for sure, I would venture that those screws were over torqued during assembly which cracked them.
Viper 1-26 INF
Member
It can be a common occurrence with some PCC bolts... https://forums.brianenos.com/topic/261015-gas-key-bolts-sheared-off/
Viper 1-26 INF said:
My Colt RO635 was made in 1983 and it is the original bolt carrier. I would say it has in excess of 100,000 rounds through it easily. My 6450 upper has over 20K though it and no issues. They have only been making these since 82 and they just now have a problem? I would say the companies making them today don't know what they are doing, buying the bolts with the wrong specs and then staking them wrong or even a buffer weight/spring issue. Looking at the way mine was staked I would say it could have damaged the bolts. Other than charging the weapon that part is just along for the ride. They should not be shearing off, their geometry is off somewhere.
Maybe they should have copied what Colt makes instead of making their own design parts.
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