Retro Arms CNC V2 for VFCRetroArms Gearboxes are manufactured from one block of aircraft aluminum (Dural) EN AW 7075 T651, they are milled on multi axis CNC machines, This VFC variant is a direct drop in into vfc platforms Ambidextrous Firing controls compatible Functioning Bolt Catch feature compatible Why upgrade your gearbox from vfc which is great to Retro Arms? Asides from increasing the lifespan of your gearbox significantly, VFC has some really thick rails where the