I've used Colt 7-round, Norinco 7-round, McCormick 8 round (2), and McCormick 10 (1) without problems.
A second McCormick 10 rounder had to be disassembled and some rough egdes around the holes cleaned up before the spring wouldn't catch and hamper feeding.
All work properly, now.
[This message has been edited by Walt Sherrill (edited July 20, 1999).]