I have done this exact same thing on 2 guns. I ended up putting single shot sleds in both of them. I didn't need to on one of them, the other I was single shot all the time anyway. Wish I could give you some guidance on why one worked fairly well and the other failed miserably, but I cannot. I am going to assume it was the magazine spring that was causing the issue. But, not 100% sure on that.
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