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Posted: 1/9/2005 11:22:31 AM EDT
Looking at different Colt M16/AR15 bolts and noticed that some have a more rounded part to the rear of the locking lugs, as well as a small diagonal cut behind the lug, on the bolt body. This was done on earlier bolts? This for stress relief?

Later Colt bolts, as well as BM bolts I have,  show a square lug profile, and no diagonal cuts on the bolt body.

Why the change? Is one type stronger than the other?

Mick
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