Double eagle mws mk18 12.5"

DE MK18 never fielded Stock internals，only has tiny scratches on the rail. After market muzzle，1x tan gunsmodify magazine I tried to fit a feda npas，it did enable adjustable FPS but reduced the stability at full auto，so I put the original valve back. Currently shooting 320FPS with 0.2g bbs，750 rpm The feda npas Will be included Collected from coventry preferred but can ship for extra