A3 Industries 1913 Polymer Folding Triangle Stock Black. With our modular mounting interface it allows the user to put a Triangle Stock on just about any firearm with a Picatinny (1913) rail. The Polymer Triangle Stock is injection-molded from super rigid 30percent fiber-reinforced Zytel by DuPont. This isn't your typical "plastic" this polymer easily rivals the aluminum variant at a much more economical price and reduced weight. Specifications for A3 Industries 1913 Polymer Folding Triangle Stock: Manufacturer: A3 Industries Color: Black Weight: 1 oz Features of A3 Industries 1913 Polymer Folding Triangle Stock Super rigid Zytel polymer 2 Quick-disconnect (QD) sling mounts at front of stock Rear textured butt-plate APEX Heavy-duty steel tensioned hinge positively latches in open position with quick-deployment from folded position Optional injection-molded rubber butt-pad and cheek-rest Package Contents: A3 Industries 1913 Polymer Folding Triangle Stock QD sling socket included A3 Industries TS-PIC-P: 1913 Polymer Folding Triangle Stock Black