M4 Monoslab Upper Assembly
 

AZR Machine and Tool Co. puts forward a alternative design for the M4 Metal Body Frame . The assembly slides horizontally inwards the lower frame. Top receiver features a 330 mm Picatinny rail that accepts a large variety of aiming devices to be mounted. Dual side rails measuring 101mm and Lower Rails to mount forward handgrips. The charging handle operates the dust cover that reveals the hop up mechanism. These top receiver assembly is milled out from one solid billet of Light Weight aluminum and subjected to Hard Anodizing to preserve and harden the material.

Too bad we can't import those into canada!

Why not?

Isn't it the upper of armalites that carry the serial number?

Or... wait..

I'm ass backwards here!

Whoops!