The OTB Muzzle Brake works the same as the standard OTB mount, only with a built in muzzle device, Made from H900 heat treated 17-4 steel this one piece adapter will allow you to mount your OPS 12th model, OCM5 or AEM5 to ANY barrel with 1/228 threads that is .75 or less OD and a minimum of 2.05 of exposed barrel MEASURED FROM THE SHOULDER.

• Model: OTB
• Material: H900 heat treated 17-4 steel
• Thread Pattern: 5/8"x24

*Item must be returned in unused condition and in the original manufacturer's packaging (if applicable). If an item arrives non-defective and accurate to its description, this guarantee does not apply and returns will not be organized in those situations. Please confirm compatibility and specifications with us regarding item Otter Creek Arms Llc OTB Muzzle Brake before purchasing if you are unsure.