T-N.T. Studio APS-X HOP-UP SYSTEM HOP-UP H+ Retrofit Kit for GHK AR Series (455mm) Category_Piston Kit which is also manufactured by

which is also manufactured by Knight's Armament Co

-Material: Aluminum alloy

：AW-M4-05

Compatible with AV-416-07

T-N.T. Studio APS-X HOP-UP SYSTEM HOP-UP H+ Retrofit Kit for GHK AR Series (455mm) Category_Piston Kit which is also manufactured byT N. T. Studio APS X HOP UP SYSTEM HOP UP H+ Retrofit Kit for GHK AR Series (455mm) Features : Simplify the original complex components. The inner barrel can be used T N. T. System all series of precision Air cushion inner barrel (O D 8. 5mm) H+ inner barrel(O D 9. 95mm), has been changed to a general specifications , to rid itself of special specifications. Improve the original innerbarrel rotation problems , improve the stability of shooting. T N.