Conduit wrote:M4, M16 and Ar15 are the same things, really.
Each model does come with its on '' default '' pistol grip, but with being one of the great things about that line of weaponry, its super easy to inter-swap and change, so yeah. Its pretty easy to swap grips.
Actually, they arent. As far as my AR-15 family knowledge goes, the AR-15 is a semi-automatic rifle, if I'm not mistaken intended for police and military use. The M16 is a militay adaptation of the AR-15, with(depending on the model) automatic, semi-automatic and burst fire capability. The M4A1 is a modified version of the M16, in a more compact shape. You may not think it is a big deal, but sometimes shortening a weapon can be hard. Take the AKS-74u. They had to modify the gas system to it could be fit into the compact size of the weapon.
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We are here because the Universe offers conditions so life can evolve,to the point where(at least one)species,in a small planet around a star lost between millions of galaxies,is able to ask itself:What was my origin? (M. Gleiser)