"The M4-SAIGA SB shock absorbing buttstock replaces your standard stock with an M16/M4 collapsible, folding and shock-absorbing buttstock system for improved accuracy and ""on-target"" time during rapid fire Advantages: Non slip design provides superior shoulder positioning enhancing tactical performance Stock manufactured to fit your Saiga stamped receiver Shock absorbing mechanism reduces recoil Replaces the original stock and operates on original folding mechanism Integrated quick detach sling swivel connectors on both sides After market sized 6061 hard anodized shock-absorbing aluminum buffer tube recoil reducing buffer, improves accuracy and ""on-target"" time during rapid fire Fit any M4 collapsible stock Built-in sealed batteries compartment Ideal for use in confined areas and close-quarter engagements Minimal size when folded Compatibility: Folding stock Saiga models"