ZRTS 1911 compensators are machined from 416 stainless steel to be able to fit your .45 ACP, 40 S&W, 10mm, or 9mm 1911s. Barrel threading choices include .575-40 or .578×28 for 45acp or 1/2-28 for 9mm. Black compensators are cerakote over the stainless.
THESE THREAD ON! YOU MUST HAVE A THREADED BARREL. MADE TO ORDER
We recommend using green Loctite on the barrel threads and blue on the set screw to keep the compensator in place.