Quote Originally Posted by RCS View Post
These stocks are quite rare to find, these were covered under US Patent by Robert Roy who worked for Colt in 1964 and these CAR-15/XM607stocks saw limited use being replaced by the XM177E2. Around 2013 a small production run of some repro XM607 stocks were produced in Texas, these were a close copy but still not quite the same. The lever inside the buttstock locks or unlocks stock.

photos show original (left) and repro and buttstock leverAttachment 111351Attachment 111352Attachment 111353
Very interesting, I've never seen one before, AR lesson of the day!
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