The VK1 is a piston driven AR15, system is designed by same guy who started LWRC. Gun runs great, very little gas blow back with or without suppressor. This is the 13.7 model with the SOLGW KNOW muzzle device that’s basically the same and dead air keymo flash hider overall length 16inch. Willing to sell with package deal with optic or without, will include one mag. Cash only. No Trades. Optic is vortex AMG-uh1 holographic red dot. With red dot $2,500 obo w/o red dot $2,000 rifle will be sold with stock furniture