Original Polish AKMS underfolder stock kit, with one pin, NOS condition...... ARMS ARE SOLID MILLED STEEL WITH TWO MACHINED LIGHTENING SECTIONS ALONG INSIDE OF ARM .... ... with the shoulder piece folded down length measurement from the buttstock center support is approximately....10 3/4 inch this measurement is mostly standard for all the AK family of underfolders.........THIS STOCK IS ANGLED.......only one pin included.... SIMULAR TO BULGARIAN AND RUSSIAN UNDERFOLDER STOCKS............... Sold as a set (as pictured).THIS IS THE ONE YOU WILL BE BUYING....S#B2 This Polish underfolder stock does not include the rear trunnion. Designed for MILLED AK receivers. Single push button allows the double-locking mechanism to release, adding to the security of the stock. Solid steel arms .... very strong ..... Polish AK-47 milled underfolding stock. Comes with all hardware in the pictures. Excellent, NOS condition (see pictures for best description).