This is a US Palm AK 30-Round Magazine with stainless steel lug in black.

The US Palm AK30 magazine is back! One of the most revolutionary AK magazines ever built is back on the market. These USA-made magazines fit most AK47-style rifles that accept double-stack magazines. With advanced polymer build and sealed design, the AK30 is one of the strongest magazines for your AK47-style rifle on the market. The baseplate and body are bonded after assembly, allowing the mag to withstand impacts that would cause other magazines to fail. Maintenance remains simple thanks to a slotted follower design that allows debris to fall clear when upside down. The AK30 also features a chromium-silicon spring that is heat-treated and built to last 100,000+ cycles. The locking surfaces are reinforced by a single piece stainless steel chassis that has been molded into the entire top of the magazine for stability and proper fit.