The SP5K is built upon the same reliable operating system found in the HK MP5 and HK94, but it is a semi automatic, blowback operated carbine. It has a retractable stock, ambidextrous controls and comes with a GL Shockwave Brace as standard equipment. The stock can be locked back into a fixed position by depressing a paddle on the left side of the rear reciever. HK Mp/Sp 5 guns is a full length semi-automatic shotgun. It's built on a polymer receiver and comes in 12 gauge, with 3 various chokes. 

HK Mp/Sp 5 guns are chambered in 9mm and they have a unique vertically-reciprocating mechanism that feeds 9mm ammunition straight into the breech, making the rivet gun fully ambidextrous. The trigger mechanism has 3 positions for different types of drills: for drilling and for driving at a push or pull action.

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