A3 Industries Triangle Folding Complete Buttstock Gen 2 Picatinny Mount 6061 T6 Aluminum Black. Our new triangle Stock is machined completely from aluminum and profiled for weight savings. With our modular mounting interface it allows the user to put a Triangle Stock on just about any firearm. Available with 2 different hinge options - A3T 2-BOLT and Picatinny (1913). Choose A3T 2-bolt hinge to mount to just about any of our 2-bolt rear stock adapters such as: CZ SCORPION CZ BREN 2 GRAND POWER STRIBOG B&T APC AND GHM AR BUFFER THREAD HK MP5/SP5 and more. Choose Picatinny (1913) to mount on firearms with rear Picatinny rails such as: AK's UTAS UT9 IWI UZI PRO SIG MPX/MCX/RATTLER and RUGER PC CHARGER. NOTE: Does not clear charging handle on ACE Galil or UZI PRO. Specifications for A3 Industries Triangle Folding Complete Buttstock: Manufacturer: A3 Industries Color: Black Stock/Brace Material: Aluminum Length: 9 in Gun Type: Universal Condition: New Weight: 13.9 oz Attachment Type: Picatinny Mount Type: Picatinny Features of A3 Industries Triangle Folding Complete Buttstock Machined aluminum body; 2 Quick-disconnect (QD) sling mounts at front of stock; Rear textured butt-plate; Heavy-duty steel tensioned hinge positively latches in open position and has quick-deployment in folded position; Optional injection-molded rubber butt-pad and cheek-rest; Package Contents: A3 Industries Triangle Folding Complete Buttstock A3 Industries TS-PIC-A: Triangle Folding Complete Buttstock Gen 2 Picatinny Mount 6061 T6 Aluminum Black