This Roller Delayed pistol redefines firearm performance with ambidextrous upper and lower receivers a 1913 rail for customization and compatibility with HK MP5 magazines. The bufferless design and folding stock compatibility increases agility and adaptability.The Roller Delayed system designed for our MAT-9K upper reduces recoil lightens the upper and increases reliability. The flexibility of the non-reciprocating and reversible charging handle makes the MAT-9K the perfect platform for any shooter.Boasting top-tier components and reliability backed by a lifetime warranty the MAT-9K Full Pistol is an embodiment of excellence. Thank you for choosing us to be part of your shooting journeyVeteran Owned and Operated Made in AmericaFeatures: MAT-K Roller Delayed Upper Receiver Barrel: 5.5 inch nitrided barrel H&K MP5 Magazine Compatible Lower Receiver Ambi Safety Upgraded mil spec trigger Type 3 anodized aluminum 1913 rail rear end for folding stock application Lifetime warranty