I just picked up a S&W M&P22 .22lr today. I went to take the A2 birdcage off so I could put my TBAC 22 Takedown on but ran into a problem. The threads on the muzzle are too long for the suppressor. I have roughly .0144 of threads still showing when I screw the suppressor on until the muzzle just touches the first baffle. I figure I have 2 options. Option 1 is to have the muzzle threads shortened slightly. Not really interested in that since the barrel is only 16" to begin with. Option 2 is to find a shim that would fit between the shoulder and the suppressor. Does anyone have any other recommendations or options? Anyone know where I can get metal shim made at least .015" thick and around .67 in diameter to match the barrel? I will be calling TBAC to see what they recommend as far as the maximum length for the threads. I don't want to screw the suppressor on too far and risk damaging the baffle. I also posted this in the rimfire section.