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Can't make out the rollmarks, but I'd say Plan9 is spot on. Mid-length 16" carbine w/ Eotech. Different from the M4 carbine (14.5" barrel) in barrel length, gas system (mid length gas systems have the gas port placed further out for longer 'dwell time' and less harsh cyclic action), obvious lack of 'fun switch'. etc.
Given Eotech's less than stellar reputation (especially on older models), I think your friend could do very well to place a Back Up Iron Sight ("BUIS") on the gun.
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