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12/15/2011 12:41:27 PM EDT
I recently purchased a 2 position receiver extension with an old style plastic stock body at a military surplus store.  I am wondering if there is any way to tell who manufactured these parts.  Did any companies other than colt manufacture 2 position stock?  It also came with a castle nut that is correct for my xm177e2 build.
12/15/2011 1:24:56 PM EDT
[#1]
Yes. Bushmaster, Essential Arms.

12/15/2011 2:42:22 PM EDT
[#2]
Are the bushmaster or Essential arms commercial or military spec diameter on the tubes?  The one I picked up is milspec diameter.
12/15/2011 6:20:29 PM EDT
[#3]
Bottom is USGI, top is aftermarket.
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