AK Receiver Flat and Rails - $14.99 : Buymilsurp.com, Your source for military surplus.
TUF-22 Receiver, Flat Top - Dlask Arms Corp.
HILL & MAC GUNWORKS CETME RECEIVER FLAT STEEL RAW - Brownells Benelux
CETME L Build Kit w/o Rail - MarColMar Firearms
Uzi – McKay Enterprises LLC
Flat Icon Appliance Set Of Receiver, Destination, Display And Other Vector Objects. Also Includes Receiver, Copper, Bobbin Elements. Stock-Vektorgrafik | Adobe Stock