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Edward if it had one it would be 1/2"X28

Edward the The - 18.5 - inch barrel is fluted and threaded with standard ½" - 28 threads per inch (TPI) for 5.56mm NATO/223 Rem. Thread cap is included. Scoped combos include the Crossfire II 2 - 7 x32mm scope with Dead - Hold™ Bullet Drop Compensation (BDC) reticle and Vortex rings.