This UTG style side folding stock adaptor connects directly to your aluminum buffer tube to convert your fixed AK or similar stock to a side folding AR15 style collapsible stock. Accepts any standard AR-style buffer tube. Can be used on Most AK47s, Shotguns, CZ Scorpion, Triarri, etc. Note: Cannot be used in AR15 platforms or any gun with recoil system extending into stock buffer tube as they can not be folded. * Weight: 121g * Connection thread: 1-3/16 inch UN16 for normal M Series * Solid alloy construction with matte anodizing finish * Compatible with most 4-position/6-position retractable stocks * Adds 45mm+ to length of pull