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I posted earlier about my first outing with my new Sig SP2022 in .40 S&W here: http://www.calguns.net/calgunforum/s....php?t=1376745was something different from the first time, the grip exchange.
So, I decided to measure the grip that was then on the pistol, the medium (03) and see how far away my thump was from the slide stop. I then removed the medium (03) and reinstalled the small (02) grip back on the pistol and measured. Gripping the pistol the same way, I noticed a distinct change in the position of my hand and fingers, the knuckle of my right thumb was over an 1/8 of an inch farther down and away from the slide release. I was surprised it was that much.
So, I came to the conclusion that larger grip was causing my thumb knuckle to ride too close to the bottom of the slide release and, under the snappy recoil of the .40 S&W, allowing it to touch the slide release during recoil thus locking it back prematurely. As to why it was occurring during the last few rounds of magazine, I figured it was probably because the pistol was shifting in my hand a bit placing the thumb even closer to the release.
To test my theory, I took the pistol with the small (02) grip installed to the range today after lunch along with 50 rds each of the Magtech and Winchester ammo. It functioned perfectly for all 100 rounds. I even relaxed my grip for a few rounds to see if that might cause a problem, but it just kept running. As you can see from the target below, it's pretty accurate.
So, I decided to measure the grip that was then on the pistol, the medium (03) and see how far away my thump was from the slide stop. I then removed the medium (03) and reinstalled the small (02) grip back on the pistol and measured. Gripping the pistol the same way, I noticed a distinct change in the position of my hand and fingers, the knuckle of my right thumb was over an 1/8 of an inch farther down and away from the slide release. I was surprised it was that much.
So, I came to the conclusion that larger grip was causing my thumb knuckle to ride too close to the bottom of the slide release and, under the snappy recoil of the .40 S&W, allowing it to touch the slide release during recoil thus locking it back prematurely. As to why it was occurring during the last few rounds of magazine, I figured it was probably because the pistol was shifting in my hand a bit placing the thumb even closer to the release.
To test my theory, I took the pistol with the small (02) grip installed to the range today after lunch along with 50 rds each of the Magtech and Winchester ammo. It functioned perfectly for all 100 rounds. I even relaxed my grip for a few rounds to see if that might cause a problem, but it just kept running. As you can see from the target below, it's pretty accurate.
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