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The single springs are supposed to be good for 300 rounds but I find about 200 and they should be replaced. Keep a check on the barrel bushing, they crack often. If the spring gets too weak it will allow the bushing to turn and probably adds to the cracking problem. There are aftermarket bushings that have thicker flanges. In my experience I like the original Colt dual spring system much more than any aftermarket single spring. Kings gunworks made a nice setup for OACP that has a dual spring, full length guide rod, heavy bushing, and plug. Dont know if Kings are still in business or not.
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