sentences:  The barrel in the closed position is locked into battery with a rear-mounted latch.The weapon lacks an extractor; cuts made into the barrel’s base assist the user in manually removing spent cartridges.The HK79 is fitted with an internal, single-action firing mechanism that has a charging mechanism located at the rear of the frame (the mechanism is cocked manually after loading the weapon) and a trigger mechanism with a button-type trigger located on the left-hand side of the handguard.