Original Arsenal Bulgarian factory production metal left-side folding Mil-Spec buttstock. This new design incorporates an integrated rubber pad for reduced felt recoil and extra comfort on the shooter's shoulder. It also provides extra length of pull. This left-side folding triangular metal stock incorporates a slick hinge mechanism for a solid lock-up. A direct replacement for the solid polymer folder that is standard equipment on the Arsenal SLR Series rifles, and uses the same standard 4.5mm pin (sold separately). It also has the same pivot pin angle as used on the SLR Series rifles. Note: The rear trunnion with folding stock hardware is sold separately.