Many years ago my friend found a CAR-15 stock in the savalge from Rock Island Arsena. I was able to get it and spent alot of time restoring it to working condition. I then attached it to a Colt AR-15 SP1 semi auto lower, to test fire with 5,56mm (it worked)
I realized that I had never fired it with the stock closed. I had an old Cobra 22 rim fire kit and put it into my SP1. Using CCI standard velocity at 20 feet from a makeshift rest and with iron sights, I got some nice groups with that 1 in 12 twist barrel and stock closed.Attachment 111328Attachment 111329Attachment 111330