Do you have a small piece of plastic/rubber (Shok Buff) installed between the recoil spring and the recoil spring guide.
Spring weight could cause your problem the following is a quote from 1911tuner, he hangs around most of the 1911 forums, and pretty much knows what he is talking about
Spring weight could cause your problem the following is a quote from 1911tuner, he hangs around most of the 1911 forums, and pretty much knows what he is talking about
Heavy recoil springs mean slower rearward travel but faster forward travel. The total cycle time changes very little, if at all. All the heavy spring does is alter the balance. Faster forward means that the magazine has to be in top form to keep up, especially on that critical last round...AND...slidelock. I've seen pistols fail to lock on empty nearly every time with an 18 pound spring, then turn around and function perfectly every time when the spring rate drops to 16 pounds.




























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