HOMEMADE 150 FPE METAL 50 CAL. BIG BORE PCP/CO2 400 PSI QEV

Updated !!! Sketch and plans for this homemade totally off the shelf re-purposed muzzle loader. It's being fired with 250 to 300 psi air from a good quality 250 psi stirrup pump or my re-purposed 30# propane tank with pop-off protection at 315 psi or a 20# propane tank with pop off set at 375 psi. The 300 to 400 psi air is obtained by piggybacking an R-22 compressor onto a 120 psi shop air compressor. The lowest pressure rated component in the system is the Alpha QEV rated at max 250 psi with a burst pressure of 2 to 3 times that. With a properly rated homemade piston valve the operating pressure could easily be quadrupled. The energy is obtained by using .7 liter ( the gun stock aluminum tank) of 300 psi air for each shot. This means that the initial pressure available at the breech is 300 psi and the final pressure at the muzzle before the bullet exits is 268 psi for a uniformly accelerated bullet in a 24" barrel with very little decrease in firing pressure. No chrony data yet, just bullet splats of 1.25" diameter from a 182 gr. .495" round ball using a steel plate 3' from the muzzle. I can disconnect from the air tank for a remote shot or remain teathered for target practice. I also have 1.5 liter HPA and 20 oz co2 portable tanks with regulators. It takes about 10 seconds to reload this gun. It's more fun than black powder. This gun is less than 8#'s has only 3 moving parts and is very sturdy. The barrel never needs cleaning. The tank size was chosen for it's comfort as a stock and the tank volumn was reduced with epoxy resin to 42 cubic inches to minimize air usage while still providing high mass air flow. A .500" pre-lubed ball is just large enough to slide down the barrel with only the weight of the ramrod . A tap on the ramrod lodges the ball into the opening of the 3/8" breech nipple. The QEV is an Alpha 5UPH4. The trigger is the 1/8" push button vent valve used as a pilot valve. This gun is also a fine arrow launcher and makes a pretty decent shotgun at 10 to 15 yards with a 180 to 200 grain shot load. i have added a CO2 system and am firing it at 400 psi now. You don't have to use a schrader, foster, quick connect or ball valve on the supply air to the QEV if you use a small orifice in that
fitting. The orifice will prevent the supply air from interfering with the operation of the 1/8" vent valve since it slows down the pressure build up in the accumulator tank.

Category:

Sports

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[mpmrla]

PVC should only be use for pressurized water. Never use it for pressurized air especially in cold

climates. It becomes brittle and can fail catastrophically. Stainless steel should be at the top of

your list followed by steel, brass copper and aluminum. Google the working pressures of any component in your system.

[ldpharris]

@mpmrla can you fire multiple shots with the same amount of air pressure without having to refill the resovoir?

[mpmrla]

@ldpharris yes. just add an air/co2 reservoir and regulator to the gun so that regulated air will be supplied to the accumulator tank for the QEV. Look at the build info video.

[n34t43v3r]

DUDE!!! what if the dog came running 4 seconds earlier?

[mpmrla]

@n34t43v3r She's a gun dog/ bird retriever. After my fisrt shot she always runs to

the pond to look for a duck. I have never hunted with her so I guess

its just in her blood. For the next shots she's in the pond searching.

I have target practiced hundreds of times and she always waits for me to

shoot then in a frenzy she starts searching. Pretty cool dog.

[mpmrla]

@mpmrla Oh an plus this dog makes the loudest most ear piercing yelps when shooting with

her so You can't help but know where she is and when she will run by. Ok

Be safe now

[ldpharris]

Would it work?

[ldpharris]

@mrprla so would a half inch diameter copper tube would work? Or a half inch diameter pvc pipe?

[ldpharris]

@mrprla

Ok thank you very much :)

[ldpharris]

@mrprla ok thanks :)

Also, how does the projectile stay in the barrel? And also, can you use a different barrel than a 50 cal one? Like a pvc or copper barrel?

[learrus]

This is incredible!

Nice work, glad I randomly found this...