This is a Tactical Solutions Compensator known as the Trail-Lite chambered in 22 LR, model TLCMP-MB.
The Trail-Lite(R) Compensators are a simple addition to spruce up any 1/2"x28 .22LR pistol or rifle. With 360 degree ports" Tactical Solutions' compensators help reduce muzzle rise on your barrel.
Features:
.900 diameter;1/2X28 threads
