The Definitive Arms VR-39 SR is a Converted Vepr Rifle with many high quality upgrades. Definitive arms starts by Shortening the barrel to 16.1" OAL, Re-Crown, then Threading the barrel in 5/8-24 cut concentric to bore for .30 cal Suppressors , Facing the FSB front shoulder true to guarantee safe usage with suppressors .
If you would like to find out more about the Definitive Arms VR-39 SR or pick one up for yourself , you can find the listing HERE
