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I too think everything you've described is normal and the gun is fine. Benelli may have slightly changed the specs on the adjustable stocks; the tolerances were so tight that they were hard to adjust. I certainly do not think it's dangerous.

@Apollyon I just picked up my first M4 (M1014) at the end of last month. Mine didn't have anywhere near that much play. I did also upgrad ro @RxArms 6 position tube. Absolutley no play in his product. Super solid and allows for the mentioned 6 positions for better length of pull and storage. He is out of Canada. With a vise, a heat gun and some patience, the instructions from @StrangerDanger were spot on and made for an easy installation. Might be an option for you to consider. 🤷‍♂️

I may have to look at that 6 position tube if anything. I rarely have time to fire the M4 sadly. When I last fired it, I don't feel the play in the stock when pushing against my shoulder. We'll see, next time I fire it, if I notice the play I may need to replace the tube with RxArms version. The thud should did have me worried though until I was told it's normal. I'm like damn... the thud doesn't seem good. If I fire, will the stock just slam into the firearm because it's not grabbing to the indents in the tube? Anyway, good to know it's normal. Again, when firing the firearm, the thud sound doesn't make itself known. Could be due to the fact, a big BOOM masks everything else around me lmao.