MEGA Arms will be releasing the 5.56 version of their MKM (MATEN KeyMod) upper receivers in the next few weeks. The MATEN system is very, very slick. It is basically an upper receiver with a built in interface to accept a proprietary free float rail. The design creates a very rigid rail system that rivals truly monolithic upper receivers.
The rails feature the KeyMod attachment system and come in four lengths:
- 14″ extended rifle length – $485 MSRP
- 12″ rifle length – $462 MSRP
- 9″ mid-length – $431 MSRP
- 7″ carbine length – $400 MSRP
Check out MEGA Arms.