The best ops 12/AE pattern mount ever made – you could try and debate it but you’d be wasting your time.
The OTB Muzzle Brake works the same as our 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 1/2×28 threads that is .75 or less OD and a minimum of 2.05 of exposed barrel MEASURED FROM THE SHOULDER.
Pick your flavor of black nitride coated or raw heat treat, slap it on your rifle and go – no custom collars or custom barrel work needed.
DO NOT USE A CRUSH WASHER WITH THIS MUZZLE DEVICE OR IT VOIDS ALL WARRANTY.




![Hornady Precision Hunter .270 WIN, 145gr, ELD-X - 20 Rounds [MPN: 80536]](https://www.tacticalwatchstore.com/wp-content/uploads/2026/10/hornady-precision-hunter-270-win-145gr-eld-x-20-rounds-mpn-80536.webp)





