Hi, selling a custom made 3 port muzzle brake for large calibre rifles. tread pitch is standard 5/8-24. brake is large enough to fit calibres up to .45cal. made of stainless steel, black nitrided, Up to 80% recoil reduction. two adjustable vertical rise screws included, and 5/8" crush washer also included. 4.5" long, 2 inch wide, and 1.25inch tall (aproxx) aprox 1lb. in weight. I shoot it with my 300PRC and 30-06, its loud as #$%#$ but almost no felt recoil! makes my 300prc feel like a 223. limited production run, 3 left of 10 price is $299-OBO