Here's the review from Airsoft Atlanta covering the KeyMod Series of the G&G Armament Combat Machine Series released for 2015... "A review of the new airsoft gun from G&G "Combat Machine" SR SERIES. These value packed AEGs feature a full metal Keymod rail system, beefed up polymer lower receiver, factory installed MOSFET unit w/fuse, removable flip sights, custom pistol grip, and more!

• CQB (Shortest model) SRS
• Midsize standard M4 length SR-L
• SR-XL Longest Keymod rail M4"