I have a bushmaster xm 15, I went to put on a sling adapter (which does not fit) and after watching youtube for disassembly instructions I realized that my buffer tube does not have the same lock nut as many other I have seen (no need for a spanner wrench???) and that mine does not have the"rib" along the underside of the tube like some others. I posted pictures to show what I mean. My ultimate goal is to put a skeleton stock on it, but I need some guidance, like how long of a stock will work, what brand/make of skeleton stock should I get, what else will I need to make it work? Thanks!
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