Specifications include, but are not limited to: 1. M4 Specifications: 1.1 Barrel: 11.5”, 4150 Chrome-Molybdenum-Steel, 5.56 NATO Marked 1.2 Barrel Rifling: Match Standard, Button-Rifled, 6-Groove, R.H. Twist 1.3 Barrel Finish: Standard Matte-Black Phosphated, Non-Reflective 1.4 Muzzle Flash Hider: Suppressor Quick Detach Flash Hider, Heated Treated Stainless Steel, Threaded on Barrel and Removable. 1.5 Muzzle Threads: Muzzle Threaded to U.S. Industry Standard ½” Dia. – 28 T.P.I 1.6 Suppressor: OSS, Model HX-QD 556 or equivalent, 5.56 Caliber, Standard Matte-Black, Non-Reflective, Corrosion Resistant Material such as Heat Treated Stainless Steel, Titanium, Titanium Alloy capable of db reduction from 150 and below 1.7 Gas System: Carbine-length Gas Tube 1.8 Gas Block: .750 Adjustable Low-profile, Pinned to barrel 1.9 Lower Receiver: Standard 7075-T6 Aluminum, MIL-Spec Forged 1.10 Pins: Nominal ~.154” Dia. Pins 1.11 Safety: Ambidextrous Safety Selector 1.12 Grip: Magpul® MOE+ Grip or equivalent 1.13 Receiver Extension Tube: MIL-Spec ~1.148” Dia. Carbine Length 6-position (Buffer Tube) 1.14 Buffer: Carbine-Length Buffer and Buffer Spring 1.15 Magazine Catch: Standard MIL-Type Magazine Catch 1.16 Buttstock: Magpul® ACS-L Carbine Adj. Stock w/QD Sling Mount or equivalent 1.17 Trigger Guard: Enlarged for glove use 1.18 Trigger: Single-Stage Trigger 1.19 Sling Mounting Provisions: Movable front M-LOK® type Swivel Mount – Push Button Swivels or equivalent 1.20 Upper Receiver: Standard 7075-T6 Aluminum, MIL-Spec Forged Upper Receiver with removable Magpul or equal backup sites MBUS front and rear sites
