[Oldexpat]

This picture looks like the rifle was a MIni14.

[ZX12R]

This picture looks like the rifle was a MIni14.

I thought that at first, but now it looks too small for that. It looks more like a pellet rifle or .22 or perhaps a .30 cal carbine they're pretty small.

[MaxMax]

From the angle I can see the gas block on the front and the Mag has a bend to it.
Doesn't seem to be a small Caliber from the pixelated angle,
and no rails on the grip. Can't see any sights on it either, or carry handle.

Looks like one of those .22's at Cheaper than Dirt with a rounded grip, made to look like an AR.

[Private_Sector_Does_It_Better]

Or a mini 30