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new benelli m4 is $1540 here in Kentucky. namely BUDS GUNS

Get a Powerball ticket! I’d take it out and test it some more to see if it vanishes on you again before doing anything more drastic. You could have had it installed where it wasn’t retaining it well. It’s not the best design to be honest. It’s one of those Italian engineer things like how the rear sling mount is installed in the Standard stocks.

I usually use a stainless TTI one. I don’t care for knurling on the knob since it can cut up my hand when I’m going fast. Some have issues with the TTI knob over inserting. I’ve never experienced this on several M4’s and dozen of clients’ shotguns. I had a carriercomp knob, and it was a masterpiece of engineering. It was knurled though and would chew up my fingers when running it hard. They’re practically vaporware these days. When found they go for an insane premium price of like 450 dollars. Lighter than the stock handle by a few grams too. The titanium FFT bolt handle gets chewed up over time by the detent in the bolt carrier. Steel wins over titanium in durability. So the notches the detent fits into get chewed up and eventually the bolt handle will just fall out.