The Shorty Doc Quad Handguard 10 inches made from 6061 T6 Aluminum Picatinny at 3,6,9 o'clock for versatile mounting options. Full length picatinny on top rail. Front and rear a QD points on both sides Retention system and anti rotational tabs that prevents movement of handguard during use. The Barrel 10.3 inch 1:7 Twist Hanson profile. DI gas system for smoother cycling and pinned non adjustable gas block. Carbine length- 556 NATO Pistol length- 300 BLK CrMoV with QPQ finish eliminating the need for chrome lining. HP and MPI tested. A2 Flash hider. MD Enhanced Bolt Carrier Group The beating heart of our rifles and there are no denying it has a strong heart. Precision ground inside and out for a near frictionless surface ensuring long term reliably. ArmorLube coating (advanced DLC and MILSPEC) Bolt is machined from 9310 steel and properly heat treated, MPI and shot peened for superior strength and durability. 100% American made and full auto capable. BILLET LOWER GEN 2 Lower receiver is billeted from 7075 T6 aluminum with a solid piece trigger guard and cut out shelf. Right side bolt release Flared mag well for faster reloads under stress. Pistol Buffer tube MD H1 buffer and stainless steel proprietary buffer spring that eliminates "twang" noise and increasing forward pressure which greatly increases reliability. Geissele 2 stage SSA trigger BILLETED UPPER Billeted upper receiver from 7075- T6 aluminum to extremely tight tolerances to ensure proper cycling and a perfectly flat surface for flush fit for the barrel. The barrel and the upper receiver are thermal fit to lock the barrel in for an extremely tight connection. This increases the rifles durability and gives it bolt like accuracy. The Shorty Doc Quad is a light weight duty grade rifle built for professional use.