So far I love the little 9mm carbine that takes Glock magazines,it runs good and even runs with steel case “junk” ammo. I noticed a thing tonight after a cleaning if you extend or collapse the stock while the bolt is open the bolt will close as in go into battery, it does not fire but it sure made me jump, so I went through other AR weapons,some even PSA or with PSA parts and no other rifle I have will close the bolt by adjusting the stock. Is this an issue, anyone else have this happen?