The 9 mm Luger-chambered barrel measures 4.7" long with a 1:9.8" RH twist and is threaded at the muzzle in ... Contact: Heckler & Koch; (706) 568-1906; hk-usa.com.

Underneath the handguard is a 5.75” cold-hammer-forged barrel that has both a tri-lug adapter and its muzzle threaded 1/2x28 TPI for use with accessories when the faux suppressor is removed.