Just a brief comment on these Magazines. These are made in Israel and function flawlessly. They are reasonably priced. Get them while they are available. Manufacturer: Command Arms Accessories MAG17 Command Arms Accessories MAG 17 AR-15 Magazine .223 Rem/5.56 NATO 30 Rounds Polymer Black with Window MAG 17 The Clear Action Mag This unique magazine provides both a clear window on the side showing the number of rounds remaining in the magazine and a full magazine indicator button on the bottom. Specifications and features: A clear window on the side of the magazine provides the operator with a visual indicator of the number of remaining rounds A white full mag indicator on the bottom of the magazine pops out providing a tactile indicator during low light conditions Polymer body provides reduced noise Includes dust cover High impact polymer 30 round .223 magazine Non-tilting follower Interior of magazine is perfectly formed to the shape of the round preventing jams and mis-feeds Corrosion resistant stainless steel spring Counting system does not interfere with disassembly or reduce capacity.