XTS PHASE 1 XTS Modular Muzzle Brakes - 2 Pieces 5.56mm NATO 1/2x28 Black. Designed from the ground up for modern rifle builds this hybrid system pairs a high-efficiency staged brake with a thread-over flash splitter/cone module. The result? Controlled recoil reduced muzzle rise forward blast management and suppressor-host-ready alignment - all in one modular ecosystem. Purpose-built for 13.7'' and 13.9'' barrels the XTS system adds +2.325'' in length bringing compliant 16'' OAL when permanently attached. This is modularity done right - engineered from inception not added as an afterthought. Specifications for XTS PHASE 1 XTS Modular Muzzle Brakes - 2 Pieces: Manufacturer: XTS Projectile Caliber: .223 Caliber Caliber: 5.56x45mm NATO Threads per Inch: 1/2x28 Gun Make: AR Platform Gun Model: AR-15 Features of XTS PHASE 1 XTS Modular Muzzle Brakes - 2 Pieces Dual-Taper Precision Lockup Integrated pin/weld hole (converts 13.7'' to rifle lengh) Duty-Rated construction Sequential port Geometry Use for recoil or flash mitigation Repeatable Indexing Remove and reinstall modules with consistent orientation Reduces point-of-impact shift variability Self-Tightening Under Pressure Gas impulse reinforces taper lock Reduced risk of loosening under sustained fire Package Contents: XTS PHASE 1 XTS Modular Muzzle Brakes - 2 Pieces What firearm models does the manufacturer say XTS PHASE 1 XTS Modular Muzzle Brakes - 2 Pieces is compatible with? The manufacturer says that XTS PHASE 1 XTS Modular Muzzle Brakes - 2 Pieces is compatible with AR-15XTS PHASE-1LA: PHASE 1 XTS Modular Muzzle Brakes - 2 Pieces 5.56mm NATO 1/2x28 Black