The Turbo(R) K-RB Integrally Suppressed Upper Receiver Group provides a host of benefits in a single package. The Turbo(R) K-RB Integral comes with a Turbo(R) K-RB suppressor which is pinned and welded to a 11.5" 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-LOK(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.