The Kalashnikov USA Triangle Side Folding Brace is designed to transform your KP9 in form and function to the original Vityaz style triangle side-folder. The KUSA triangle brace latches to the receiver when folded by use of the integrated hitch. This is a close as you can get to the original SBR without the tax stamp and waiting period. - 5.5mm pin Triangle Pistol Brace - Based on the Russian Vityaz Stock - Fits on the KP-9 Pistol - Weight: 0.45 lbs. - Dimensions: 10 x 1.5 x 4