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Posted: 8/16/2016 3:39:16 PM EDT
| Could a ar10 receiver extension be used to run an A5 system or do you have to have an A5 extension? Saw another post that mentioned it but had never heard of it. |
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Yes. A5 extensions are the same size as Armalite 308 carbine extensions. Please note that some companies use standard AR15 length carbine extensions in their 308's. They just use a shortened buffer and spring. Armalite uses a standard AR15 carbine length buffer in their .308 (H3 weight) and their own 308 spring that works in both Armalite's carbines and rifles. |
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Yes, you can run an AR-10 buffer tube in place of an A5, but if you're going to do this on an AR-15, you'll have to either use the A5 buffer, or, if you're going to use an H3 carbine buffer, you'll have to make a spacer to drop into the buffer tube before you install the spring. I've used Armalite and Rock River .308 buffer tubes, one being commercial and the other mil-spec, but the spacer will be different, because they are different lengths internally. One spacer will be 1" and the other will be 3/4". To make the spacer, I use a piece of 15/16" 6061 aluminum bar stock. Cut it to 1" or 3/4" lengths and then turn each to 3/4" diameter for all but 1/16" of their length. That will leave you with two spacers that look like small top hats. Put the spacer into the end of the spring that goes into the buffer tube and assemble.
I've done several of these and they work perfectly. Use an H3 carbine buffer, an A2 spring and the appropriate spacer for the tube, and you end up with a poor man's A5 system. The Rock River tube is commercial diameter and uses the 1" spacer, whereas the Armalite tube is mil-spec and uses the 3/4" spacer. The difference in the length of the spacers is because the tubes have different internal depths. I've included a pic of the prototype for the Rock River tube, which is made from UHMW plastic and a fender washer. 
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