YHM is pleased to offer the TurboA(R) Integrally Suppressed Upper Receiver Group. The TurboA(R) Integral comes with a TurboA(R) suppressor which is pinned and welded to a 10.5" 5.56mm barrel. With a combined barrel/suppressor length of just over 16" this system only requires a single tax stamp purchase. Includes a lightweight M-LOKA(R) Handguard YHM Mil-Spec A3 upper receiver and a specially designed gas block which reduces blowback and cyclic rates.Does not include Bolt Carrier Assembly or Charging Handle. Caliber: 5.56mm Weight: 3.6 lbs. Length: 23.5" Diameter: 1.5625" Suppressor Construction: 17-4 Ph SS/Cobalt-6 Blast Baffle Decibel Rating: 134 dB 5.56mm Full Auto RatedTurbo Integral Suppressed Upper receiver group contains: Integral Turbo Sound Suppressor Assembly MR7 M-Lok Handguard Flat Top A3 Upper Receiver Assembly (YHM-100) Low Profile Suppressor Gas Block (YHM-9389-SS) Black Plated Gas Tube (YHM-BL-04A)