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. shipping is 4.25 Buy more than one and save on Shipping. 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 Nontilting follower Interior of magazine is perfectly formed to the shape of the round preventing jams and misfeeds Corrosion resistant stainless steel spring Counting system does not interfere with disassembly or reduce capacity.