FAB Defense M4 R10/22 Collapsible- Ruger 10/22 Rifle Stock The R10/22 M4 Collapsible Stock Conversion Kit presents a high quality and ability enhancing tactical upgrade for the Ruger 10/22. This unique stock offers the perfect combination of a classic bench-rest design with a modern tactical versatility and buttstock features. 1913 MIL-STD Picatinny side and lower rails Allow secure mounting of any picatinny based accessories Quick and easy drop-in installation Collapsible buttstock system with 5 length options Side folding buttstock (left folding by default) for compact carry and storage Quick-Detach sling swivel sockets on both sides Ergonomic design prevents wrist fatigue and ensures secure grip Finger grooves and backstrap shape improves trigger operation Durable and lightweight fiberglass reinforced polymer construction Manufacture 25-Years Limited Warranty