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I had that exact same problem in warmer temperatures. It was due to two reasons, one was my mag release wore down to the point that the mag was not seating high enough for the knocker to hit it effectively, the other was the hammer spring. I replaced the hammer spring with one from the MAG spring set, and got a new mag release from Guarder.
Fixed the immediate problem and it started to shoot well again, but the knocker ended up getting chipped from the stronger spring. The Guarder hardware is also garbage. I haven't gamed my 5-7 since I installed the hardware, but 3 of the 5 pieces have already broken.
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