Chalk up another SW22 owner with the overtight screw. I wish I would have checked the forum first when I was having problems. I guess I got lucky. I went to break the gun down to inspect and lube it before its first range trip. I tried the factory hex wrench then moved to one that was longer to get more torq on it. I need to inspect the screw head better, but I'm sure I rounded it off. I got lucky and got screw to break free, but I thought I snapped the hex wrench. Maybe I can get S&W to send me a new screw. I got a about 150 rds through it, but was having feed problems on the first few mags (I guess to be expected with a new firearm). I was using CCI std velocity ammo for the first 100, then switched to Aguila super extra for the last 50 and it ran very well.