FAB Defense M4 SKS Complete Chassis System w/ M4 Buttstock FDE. FAB Defense constructed these Rifle Stocks from rugged lightweight fiberglass reinforced polymer with 5 QD sling swivel sockets for seamless sling attachment. The FAB Defense M4 SKS Complete Chassis System w/ Folding M4 Buttstock contains the quad Picatinny rail system that provides plenty of space to mount sights lights and lasers for enhanced utility. If you're looking to step up your firearm's potential in the field use this FAB Defense M4 SKS Complete Chassis System w/ M4 Buttstock. Specifications for FAB Defense M4 SKS Complete Chassis System w/ M4 Buttstock: Manufacturer: FAB Defense Gun Model: SKS Length: 830 mm Weight: 1200 g Condition: New Features of FAB Defense M4 SKS Complete Chassis System w/ M4 Buttstock Quad Picatinny rail system- Upper Lower & two removable side rails Folding buttstock - Push-button side folding mechanism and spring based locking in folded position Five QD sling swivel sockets Large ergonomic pistol grip Integrated enhanced magazine release lever Three buttstock options M4 collapsible Shock Absorbing or UAS Durable and lightweight fiberglass reinforced polymer construction Package Contents: FAB Defense M4 SKS Complete Chassis System w/ M4 Buttstock What firearm models does the manufacturer say FAB Defense M4 SKS Complete Chassis System w/ M4 Buttstock is compatible with? The manufacturer suggests that FAB Defense M4 SKS Complete Chassis System w/ M4 Buttstock is compatible with SKSFAB Defense FX-M4SKST: M4 SKS Complete Chassis System w/ M4 Buttstock FDE