Meraki Machine G5 Muzzle Brakes, 3 Port, Raw Built out of Ti-64I-4V Titanium; Lightweight effective design; 3 Ports; Self-timing Brake; Easy to mount; Weight: 0.9-1.7 Oz; 2.125" overall length; Ports designed to keep muzzle jump down; 6.5 mm caliber good for any caliber up to and including 6.5 mm; .30 caliber good for any caliber up to and including .308; LOCK NUT IS A LEFT HANDED THREAD! Muzzle brakes have right handed internal threads. When possible some form of thread anti-seize is recommended on lock nut threads.; If a product is marked as "UNAVAILABLE" it means its a product sku we do not produce and is not available for purchase. If its marked "OUT OF STOCK" we do produce it but it is just currently out of stocked inventory, we do not sell past our stocked inventory. ; 0.725" only comes in 1/2-28 TPI, 0.850" is the smallest we produce a 5/8-24 TPI.;