SBR

SLR-106UR SBR, 5.56x45 caliber, Bulgarian receiver, with side rail.

NFA Firearm*

SLR-106UR SBR, 5.56 x 45 mm Caliber, Bulgarian receiver, Quad rail, Black polymer furniture NFA Firearm

SLR-104UR SBR - 5.45x39.5mm caliber, Stamped receiver, short gas system, front sight block / gas block combination, polymer buttstock, Featuring Arsenal's Mil. Spec. Picatinny Quad-Rail System for attaching Lasers, Flashlights, and Optics..

SLR-104UR Factory SBR (Krinkov), 5.45x39mm, stamped receiver, short gas system, front sight/gas block, NFA Firearm.

SAM7SFK SBR - 7.62, milled receiver

SLR-107UR SBR - Factory SBR, 7.62 caliber, stamped receiver, short gas system, front sight block / gas block combination..

Factory SBR, 7.62 caliber, stamped receiver, short gas system, front sight block / gas block combination, 24x1.5mm right-hand threads, may ship with Bulgarian 4-piece or cone flash hider, black polymer ribbed handguards, stainless steel heat shield, left-side folding black polymer stock, 2-stage trigger, cleaning rod, and scope rail. NFA