Made from 6061-t6 aluminum that's been hard-coat anodized, this Krebs Custom M4 Buttstock Adapter permits the user to install an ar/m4-style collapsing buttstock onto their saiga, romanian, or other standard-pattern stamped-receiver rifles. It will also fit saiga shotguns. FeaturesContoured for ar-15 or magpul prs (or similar) buttstocks.There is no need to remove the tang on your rifle. Notes:Will not fit on yugoslavian-pattern rifles.Will not fit vepr fm-ak47-11 or fm-ak74-11 rifles.Will fit polish tantal riflesWill not fit draco or mini draco