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Hi Joseph, This will fit but its out of stock right now https://www.budsgunshop.com/catalog/product_info.php/products_id/81610/Aim+Sports+MT021+Base+For+M4+Weaver+Style+Black+Finish

Its available here - https://www.sportsmansguide.com/product/index/aim-sports-m4-carbine-drop-in-quad-rail-handguard?a=762746&pm2d=CSE-SPG-15-PLA&utm_medium=PLA&utm_source=Google&utm_campaign=CI&gclid=CjwKCAiA_c7UBRAjEiwApCZi8eDbPrvpVKmEc7iwRgy3v1pI_z-XJQ_fFP3ei7UkDPBATciffdZpZhoCyvcQAvD_BwE

This one will work it's in stock too - https://www.budsgunshop.com/catalog/product_info.php/products_id/10143/NCStar+MAR4S+Quad+Rail+For+Carbine+Weaver+Style+Matte+Black+

This will take a "Standard Carbine Length Quad Rail" Joseph. https://www.budsgunshop.com/catalog/product_info.php/products_id/82712/Pro+Mag+PM242+AR-15%2FM4+Rifle+Nylon%2FAluminum+Black or https://www.budsgunshop.com/catalog/product_info.php/products_id/10143/NCStar+MAR4S+Quad+Rail+For+Carbine+Weaver+Style+Matte+Black+ (Ruger Recommended here : http://shopruger.com/M4_15-Carbine-Length-Drop-in-Quad-Rail-System/productinfo/18437/

Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

Right from Ruger http://shopruger.com/M4_15-Carbine-Length-Drop-in-Quad-Rail-System/productinfo/18437/