This is a full reinforcement pack for the NT79. Incorporates 1.5" round breech for easy machining from metal stock on a small lathe or with hand tools. Receiver - lever unlocked, reinforced locking recess, reinforced and extended rear stock attachment points. Lower stock attachment lugs are still pin type, upper lugs were changed to use m3 screws with m3 nuts epoxied into the receiver lugs. Hammer - reinforced to be utilized with a stiffer spring in the stock rather than AR coil springs - easily tunable, more power for SPP or ramsets. Receiver will still accept an AR spring type hammer from the original kit if you just want the reinforcement but not the inline ignition setup. Cocking lever - widened at rear section to allow a metal rod to be inserted into both sides. Receiver and stock inletted to allow clearance. Stock - converted to accept M3 screws for upper attachment, merged into 2 pieces instead of 3, rod arrangement deleted in exchange for a stronger dovetail joint. Rear section with QD attachment point included.