Impact and crush resistant polymer construction; Slimline design for increased pouch compatibility; Constant-curve internal geometry for smooth feeding; Anti-tilt, self-lubricating follower for increased reliability; Black-oxide coated (MIL-DTL-13924D) USGI-spec stainless steel spring; Transparent windows on both sides of the PMAG 30G MagLevel along with a painted indicator on the spring allows for easy determination of rounds remaining; Flared floorplate for positive magazine handling and easy disassembly