CMMG ceramic Coated 42 Round Magazine spring MIL SPEC No Memory 5.56 NATO .223 Rem. Fits AR-15, M-16 and M4 clips. Ceramic coated tri wound 3 wire upgrade springs for the 42 round and other assult rifle clips ( can be cut shorter to accomodate others). Manufactured by CMMG industries, the ones that supply the military - yes these are NEW ORIGINAL OEM mil spec military springs. You can cut them down about 1.5" for use in the smaller mags. Keep your clips loaded and fully functional with these as they do not have the memory that stock clip springs have. These are actually three springs wound into one spring - tri wound. Sold by the piece. We cannot ship these to California, New York, Illinois or DC. Any orders places from those states will be cancelled.