Looks like the upper and lower receivers are a copy of the AR15/M4/M16
Check the placement of the controls; safety, mag release, bolt release. Also the front and rear disassembly pins, charging handle, buttstock and buffer tube.
It looks like it has a piston instead of Direct Impingement.

Colt AR-15 carbine
image from here
Silver Cloud wrote:Seems like Reverse engineered HK-416
Yes, for all practical purposes, the HK 416 is a piston operated M4/M16
“Never give in, never give in, never; never; never; never – in nothing, great or small, large or petty – never give in except to convictions of honor and good sense” — Winston Churchill, Oct 29, 1941