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Posted: 12/26/2012 1:48:14 PM EDT
| So... I am putting another AR together. I have a carbine gas system, and want to use a fixed stock. Am I good to go running a carbine length spring & buffer in an A1 receiver extension? |
| If you could find a piece of aluminum rod of the correct diameter I would think that would be best. I would JB weld it in place. Measure several times and make sure it is long enough. If it is too short the inside of the upper receiver and the gas key will be damaged, too long and the rifle will short stroke. |
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Quoted:
There is not enough dwell in a carbine gas system to reliably and consistently run the weight of the rifle buffer and length of the rifle system. Are you sure about that? I have see a bunch of carbine varmint rifles with rifle extensions that worked perfectly fine. |
| No shit. We don't however, know what length barrel he is running. The shorter the barrel the more pronounced the unreliability will be. It may indeed run well enough for a plinking gun but it will not be reliable enough for anything else. If you are suggesting he assemble his rifle in a half assed manner, that is fine, but my bet is that everyone wants to assemble the best rifle possible. |
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Here is an old thread with people that had carbine uppers with rifle extensions with rifle buffers
http://www.ar15.com/archive/topic.html?b=3&f=118&t=523554 http://www.ar15.com/archive/topic.html?b=3&f=118&t=477047 Tons of carbine uppers were used on lower with rifle extensions back during the ban days. ~ a rifle buffer is 5.1oz A H3 is 5.5oz |
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Quoted:
So... I am putting another AR together. I have a carbine gas system, and want to use a fixed stock. Am I good to go running a carbine length spring & buffer in an A1 receiver extension? NO, NO, NO. Never run a carbine buffer in a full length rifle tube. If you do, the carrier key will slam into the back of the charging handle and the ring of the lower receiver. Things will get broken and you will be eating your charging handle for lunch. The gas system length of the barrel basically has nothing to do with the type of stock you are going to use. |
| Good grief. I run two 16" carbines with rifle buffer tubes, rifle springs and rifle buffers. They do carbine matches and local DCM type matches. They have NEVER failed to function with commercial .223 or any of the 5.56 LC over runs and seconds available to civilians. |
Roger that on a spacer. I recently removed my first A2 stock - SOB was that thing King-Kong tight... anyways, took the screw out of the back end and off comes the outer part of the stock. Battled the tube and got it loose. When I picked up the "shell" to move it, out falls this round black spacer with a hole in the center. Took a minute and figured out what it was. When I later went to install the A2 stock on a different Lower, I almost forgot the spacer. 
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Quoted: Roger that on a spacer. I recently removed my first A2 stock - SOB was that thing King-Kong tight... anyways, took the screw out of the back end and off comes the outer part of the stock. Battled the tube and got it loose. When I picked up the "shell" to move it, out falls this round black spacer with a hole in the center. Took a minute and figured out what it was. When I later went to install the A2 stock on a different Lower, I almost forgot the spacer. He's talking about a spacer that goes inside the rifle receiver extension to allow use of shorter carbine-length spring & buffer. Yours is the spacer that makes the rifle extension originally designed for A1-length stock fit the slightly longer (about 5/8") A2 stock. If you put an A1 stock on it you'd leave out the spacer and use a shorter butt screw. |
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Quoted:
There is not enough dwell in a carbine gas system to reliably and consistently run the weight of the rifle buffer and length of the rifle system. Quoted:
I'm sure it makes a handy varmint rifle if that is the intention. I sure wouldn't trust it to run 100% reliably. Quoted:
Why would you ever run an H3 carbine buffer? What in the holy hell are you talking about? The carbine length gas system has been being used reliably and without issue with rifle stock components from 10" XM177E1 uppers in Vietnam, to NSW 14.5" RO727 uppers, to 16" banglorious setups. The H3 weight buffer has quite a few uses, included, but not limited to improving reliability in overgassed carbines, whether due to manufacturing specs, or gas port erosion, as well as in some suppressed configurations. OP - skip the crazy spacer, it is just about the epitome of a solution in search of a problem, just use the proper buffer and spring. ~Augee |
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