Semi translucent plastic shell.
Interlockable notches on sides.
Famed Taiwanese airsoft manufacturer GHK as been known to make some of the best performing and gas efficient gas blowback rifles available on the market. Starting off with bringing some of the best AK GBBRs to market GHK quickly became the industry standard when talking about said platform. Not satisfied with just being the leader of the GBBR AK market they quickly branched out and took the GBB AR market by storm. With their engineering know-how they rose to the top of the game as well, making he GHK M4 a highly sought after product.
GHK 553 Gas Magazine