Made for dedicated suppressor use Width: 2.06 inches OAL Height: 2.6 inches Internal Diameter: 1.8 inches Fits A1 and A2 models of MP5 variants Professional grade one-piece design Simple installation, includes all tools Extremely lightweight design One five-slot M-LOK compatible rail included Features two anti-rotation QD sling swivel sockets Constructed from Hard Coat Anodized 6061 Aluminum for a lifetime of service Made in the USA 922R Compliant Lifetime Warranty Patented and Patents Pending Product Compatible with HK MP5, and clones such as Century AP5/K, Zenith ZF5/K, and Military Arms Corporation MAC 5/K Installed Weight: MP5-SD - 9.4 oz