The upper receiver is a brand new Bushmaster 20" chromed lined fluted barrel, A2 upper without the
rear sight. There aren't any rear sights installed because the water jacket is high enough to
completely inclose the front sight base. The gas tube has been sealed with 1,200 degree silver
solder. The barrel is enclosed in a very heavy walled aluminum tube water jacket that is black hard coat
anodized. The water jacket holds a little more than a gallon and half of water. The water jacket mounts
onto the threaded muzzle of the barrel and is held in place by an A1 flash hider. The rear of the water
jacket mounts to a free float barrel nut. The operation of the upper is the direct gas system. All
screws are tapered flush mounted allen head. The water jacket cold water supply comes in at the
bottom of the chamber end and exits near the top at the muzzle end of the water jacket. The supply
hoses are 3/8" braided fuel line, so they won't collapse, with fine stainless screen and brass one-
way valve at the inlet. Both the inlet and outlet hoses have brass 3/8" quick disconnects for ease of
set up. There is also a 1/2" plugged pipe fitting at the top on the muzzle end to facilitate quick filling
of the water jacket. Water is circulated by using an in-line squeeze bulb.
The complete water cooled upper package, including all of the above, brand new complete
Bushmaster 20" fluted water cooled uppers that I would sell for $1,950, not including shipping. All
funds to be up front. I'm not interested in any trades. Upper has been function tested with 28
rounds of Remington .223 and for water seal. Upper will include water supply hoses, quick
disconnect fittings, complete water jacket, with a GG&G UFIR installed on the bottom at the balancing
point. The complete upper would include Bushmaster full auto bolt group
use it as a fire extinguisher or just have a party andl fill that up with beer