The Barrel is a 3/8 inch hydraulic brake seamless ss tube shrouded with a pvc pipe and tipped with a muzzle brake. The ss tubing is stiffened by wrapping 3 rubber tape bushings around the barrel to get a nice fit inside the pvc pipe and JB weld is injected through 3 holes drilled in the pvc just behind each bushing. This keeps the tubing from vibrating during the pressure surge thereby increasing accuracy. I also crowned all ends of ss tubing with a bevel cutting bit to remove any burrs to increase accuracy. Oh, incidently do not cut any of your tubing with a pipe cutter. The receiver is a 3/8" compression tee modified to accept a bolt and gravity fed ammo from the magazine through a 3/8" hole in the face of the compression nut on the leg of the Tee. A rare earth magnet holds the carbon steel bolt handle in the closed position. There is also a rare earth magnet on the barrel end of the bolt for holding ball bearings in place.The gun is fitted with a red dot scope for daylight shooting and a laser sight for night time fun. The firing valve is a 3/8" alpha QEV. The trigger is a 1/8" pushbutton valve. The accumulator tank is a 1" diameter by 12" long pipe shrouded with pvc. the plumbing from the A side of the QEV is covered with foam rubber to make a comfortable grip. The pressure supply ball valve has been omited and replaced with a properly sized orifice to allow the gun to auto recharge at a rate slow enough to allow the 1/8" vent valve to trigger the QEV. This also minimizes moving parts, simplifies the gun and makes it easier to fabricate. You can drop this gun in the mud and clean out the barrel bolt and magazine tube by dry firing it with the magazine empty with end cap removed and the bolt in the open position. There are only 2 moving parts exposed to the elements and they both get a quick clean out of dust and sand with each shot. I took a look at using a slide check and adapting a nice comfortable trigger and decided that an internal orifice was a simpler way to go. You can see the only 2 moving parts in my video. The gun weighs a few ounces over 5 lbs. and can easily be held and shot like a pistol. Ok, i quess you can cut 12" off the barrel and 6" off the accumulator tank and voila' a pistolla. By keeping supply pressure on the pilot side of the QEV at all times during firing the safety of the QEV is "way mo betta" I have been researching all the neat parts on palmers pursuit shop to determine where to take it to from here. This gun is more fun to shoot than my .50 caliber QEV gun. I have already shot about 200 rounds through it in 1 week. The ammo is cheap. Just buy 8 lbs packs of reloaders #000 cold swaged buckshot .360" +.001 -.000. I am now shooting it with 400 psi regulated CO2 and it will drill through 3/4" yellow pine at 10 yards. The gun can be viewed on my youtube channel at:
http://www.youtube.com/user/mpmrla?feature=mhee
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