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Same here but not that many rounds anymore. I am down to 300 . I had the 27 all but sold last year But then the buyer backed out.

Local dealers offered 350 and my guess is i will sell it and move on one day.

I would assume 95 percent of all 40 kaboom is bullet setback. Also, most of them i have seen have been with 180 grain loads. like Andy said, a tiny bit of setback in some 40 loads causes huge spikes in pressure. That and the unsupported chamber can and have led to boom.

Never had problem with my 27 but i did buy it before my glock 20. I only carry it once in a while now that i have a 9mm shield.

Will i ever buy another 40? Probably not. I will eventually sell this 40 and get a glock 29 .