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Posted: 10/22/2011 12:34:10 PM EDT
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I'm looking at a non-factory Registered Receiver M16 that the owner describes as being a bit picky about its configuration. Specifically, when using a 223 upper and an A2 stock, or a 9mm upper and a CAR stock it works fine. When using a 223 upper and a CAR stock, it is prone to hammer follow through. It sounds to me as if the autosear is releasing the hammer a bit early in the cycle and/or some carrier bounce is happening.
This may be happening only on an 11.5" barrel. I have to verify. This is happening on all barrel lengths. (11.5", 16" and 20") Any other ideas? Is this problem unknown on M16 receivers or is this indicative of a misdrilled autosear pin hole? Can this situation be rectified or is this something I should pass on? Thanks for the help! |
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Or it could be a classic case of bolt bounce, which is a gas/buffer issue. Really, the receiver is the last place you look in these cases, because by far the majority are issues with the uppers.
There is no registered receiver which cannot be brought into spec, unless the receiver was grenaded and patched together incorrectly. Worst case, if you need to weld up all the receiver holes and start over, you are only talking a couple hundred bucks of work on a $10k receiver. It's a negotiating point, not a reason to pass, as long as the price is right. And FWIW, my Colt factory M16A1 –– which I bought in '94 ANIB and I know is 100% in-spec, will not run a 20" barrel with a CAR stock and any buffer. That's an unsupported configuration. It will run any supported (milspec) configuration; when I get beyond those parameters, I need to do the development myself. 
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Tony-
A long time ago I was in the customer service department at Colt and I saw an AR propped up against a wall behind the boss's desk. I asked about it and was told that it had come in with a 20" barrel and a collapsible stock and just would not run. They had messed with it exhaustively and even they couldn't figure out how to get it to work. It's just a configuration that won't work reliably and they had no idea why. |
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Quoted:
Tony- A long time ago I was in the customer service department at Colt and I saw an AR propped up against a wall behind the boss's desk. I asked about it and was told that it had come in with a 20" barrel and a collapsible stock and just would not run. They had messed with it exhaustively and even they couldn't figure out how to get it to work. It's just a configuration that won't work reliably and they had no idea why. Yup, that's also what Dennis Todd and Ken Elmore told me –– and they are my go-to M16 gurus. The A5 receiver extension appears, so far, to solve the problem. But I need more range time to convince myself. 
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Quoted:
Tony- A long time ago I was in the customer service department at Colt and I saw an AR propped up against a wall behind the boss's desk. I asked about it and was told that it had come in with a 20" barrel and a collapsible stock and just would not run. They had messed with it exhaustively and even they couldn't figure out how to get it to work. It's just a configuration that won't work reliably and they had no idea why. But isn't that the configuration that the Canadian army now uses? I wonder what they did... |
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Quoted:
Quoted:
Tony- A long time ago I was in the customer service department at Colt and I saw an AR propped up against a wall behind the boss's desk. I asked about it and was told that it had come in with a 20" barrel and a collapsible stock and just would not run. They had messed with it exhaustively and even they couldn't figure out how to get it to work. It's just a configuration that won't work reliably and they had no idea why. But isn't that the configuration that the Canadian army now uses? I wonder what they did... Those weren't built or developed by Colt itself –– it was all done by Diemaco in Canada, and they treat that info like a military secret. Colt owns Diemaco, but if an order for those comes in at Colt, Diemaco builds 'em. AFAIK, tho, No one in the U.S. has ordered that config, so Colt has not had reason to ask the Diemaco gurus about the configuration. Wish I knew a Canadian military armorer to ask.
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Quoted:
Quoted:
Quoted:
Tony- A long time ago I was in the customer service department at Colt and I saw an AR propped up against a wall behind the boss's desk. I asked about it and was told that it had come in with a 20" barrel and a collapsible stock and just would not run. They had messed with it exhaustively and even they couldn't figure out how to get it to work. It's just a configuration that won't work reliably and they had no idea why. But isn't that the configuration that the Canadian army now uses? I wonder what they did... Those weren't built or developed by Colt itself –– it was all done by Diemaco in Canada, and they treat that info like a military secret. Colt owns Diemaco, but if an order for those comes in at Colt, Diemaco builds 'em. AFAIK, tho, No one in the U.S. has ordered that config, so Colt has not had reason to ask the Diemaco gurus about the configuration. Wish I knew a Canadian military armorer to ask.
Check out this thread: http://www.ar15.com/forums/t_3_127/551044_M16A2_s_with_M4_Stocks_.html |
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