From EMG we have the SAI 5.1
With SAI (Salient Arms International) official license
Titanium nitride style SAI barrel and on-frame integrated accessory rail
Features:
Adjustable hop up
Reallistic blowback system
Weight: 1035g
Length: 220mm
Muzzle velocity: 300fps
Mag capacity: 31rds
Power source: gas
Front and back sights Combat style with optic fiber
Ambidextrous selector
Shooting mode: Semi automatic