(1) Used Factory German HK MP5-N Navy 9mm Front, with factory 1/2x32 threaded H&K barrel and tri-lug. Front end from demilled police dept trade in parts kit includes trunnion, front sight-blade, dust Cap, cocking support, cocking handle, cocking tube, sight tower, thread protector and of course a good to very good used barrel. This is perfect for re barrelling a Heckler and Koch HK 94/MP5 or as the core of a build. Barrel has German HK proof marks and is renowned for quality. Because this barrel is threaded, you can choose from a variety of options on muzzle devices from flash hiders, thread protectors, and suppressors using either the threaded barrel or the tri-lug for fast QD mounting without the risk of backing off. Stock Photo. Because the barrel is under 16", ALL NFA RULES APPLY.