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AR15.COM
7/1/2001 5:46:15 PM EDT
I have seen some new colt uppers advertised with the colt universal conversion pin. Will this work with any combination of large,small hole uppers and lowers? I don't see how it could.
7/2/2001 10:48:54 AM EDT
[#1]
I've never seen a truly "universal" conversion pin - usually there's a conversion pin for putting small-hole uppers on large hole lowers, or a bushing to put large-hole uppers on small hole lowers.

While I've never seen both in one device, I guess it's possible someone's come up with such a critter.  The most usual conversion need is for large hole lowers to small hole uppers (with all the large-hole pre-ban SP1 and Sporter II lowers out there), and that would use the offset conversion pin.