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This new amazing Retrofit Kit was especially developed to replace and upgrade the entire VFC M4 HOP-UP structure. With the ongoing demand for quality upgrade parts for VFC M4 GBB, T-N.T. STUDIO has developed this Retrofit Kit which includes all necessary parts inclunding a HOP-UP bucking and HOP-UP chamber.

●HOP-UP Chamber : formed integrally aluminum CNC , strong & durable !!

●HOP-UP bucking : development for VFC M4 series exclusive T-Hop UP system Rubber !!

●The pressure block is the vertical, and use of trailing edge cover design, when adjusting HOP-UP, the pressure block will be not incline.

●Add a elastic O-ring rear of HOP-UP chamber, closely integrated with the outer barrel, will be avoid the chamber slide and adjust ring too tight cause not to adjusting HOP-UP.

●BB loading position more accurate, effective performance improvements !!

●effective improvement BB feedings issue, airtight and bucking's lip fold inwards problem.

Precision Air-cushion inner barrel (455mm), with the original outstanding gasification performance, let your VFC M4 enhance to next level !!

●All products are recommended to have DIY ability to use.

●Before the modify, recommended to check and exclude the original issues to achieve the best results, or commissioned by the store to modified.

●Replacement of kits does not mean that can solve all the original parts of the problem, sometimes still have to modify the other components to achieve the best performance.