I have an oppertunity to buy 1 or 2 AR-15's. First one is a "Rock River AR-15.com" commerative edition with case It is an M4 look alike w/faux flash suppressor and an Aimpoint type sight and a tactical carry handle. He is asking 875.00 for it. 2nd one is a Colt AR-15 H-Bar match 16" Flat top w/ ATN Scope He is asking 850.00 for it. Is this a good deal or should I pass on either one ?