Two Marauder P-rods...

[tefloncoated]

Here are two of my latest projects... Both share very similar mods as far as internals - extra heavy hammer springs, 5/32 TPs, heavy mods on the valve... Both are set up with red dots and both are intended for 10-30 yards. One is for plinking, the other is.. for heavy hitting plinking lol.

#1. A 13ci bottle conversion, regulated @~1400psi.  Making 16+fpe with 25.39gr JSB Monsters. 100+ shots (?)  from 3k fill. I don't know for sure how many, I got tired after 50 shots from 2500 down to 1800 psi lol. Very quiet for backyard plinking.





#2. A high power Prod, making 38fpe with 32.4 gr Eun Jins. 14 inch cut and re crowned .22 Mrod barrel, Lloyd's Double Tube, tapered probe.  Two full mags from 3k to 2k psi. Boy this thing is loud. But the moderator takes it down a notch. Hits almost as hard as my regulated .25 Mrod @42fpe. 

[RatRacer]

Nice. How accurate does #2 shoot with the choke cut out of the barrel?

[EdinGa]

I love #1. What sort of adapter did you use with the hpa tank?

[tefloncoated]

Thanks guys. 

JDSAirman makes some nice products for these conversions - adapters, tanks and regulators.  My next project is a 500cc bottle conversion of my Mrod.  I also have a video of the installation I'll post later.

The accuracy on the cut down barrel is good.  For the intended purpose and with the given optic I'd say great. Dime sized or smaller groups at 10 yards with a red dot. I was also hitting the large spinner of the .22LR steel target set @43 yards, off hand as a pistol, 3 for 3.

[TleVta]

38 ft lbs?? Sweet...

[moorepower]

What buttstock is that?

[nervoustrigger]

Heh heh   38fpe hawg leg.  Very nice.  That's right where the QB is running that I'm trying to wrap up for Ron.  And that sucker's loud bare-barreled too.  Apples and oranges though.  Low pressure/long barrel vs high pressure/short barrel.

Interesting guns you've put together.  Keep us posted on how they shoot.

[tefloncoated]

You really DONT NEED all that power in a P-rod.  Lol.  But it's there if you want it.  Gets a lot more shots @ 29-30 fpe.  I'll post some strings later.

Here is a short video of it shooting through half inch pine board.  Didn't hit 38 fpe on this run - changed a few settings before the shoot, so just shy of 37 now.

[tefloncoated]

What buttstock is that?

I made it out of a Swiffer Jet

http://www.gatewaytoairguns.org/GTA/index.php?topic=91058.msg853196#msg853196

[oldpro]

WOW great work!!! I'd take any of them.

[tefloncoated]

WOW great work!!! I'd take any of them.

That's a high praise coming from you, Travis! Thanks man

[PBguns]

Whoa those are nice. You got both sides of the spectrum covered.....and then some! Well done. 

[tefloncoated]

That Double Tube P-rod is a 2-in-1 lol. Check out this string, using 21.14gr Kodiaks:

Get two shots at max power settings (4HS 1/2HT) @35 fpe
Lower spring tension to 2HS, get another 22 shots @ 27-30fpe until you hit 1900psi...
Lower spring tension to 0HS, get another 15-16 shots @ 22-24fpe until you hit 1300psi...
All from the same fill, 2900psi



And here is the max power string, touching 38fpe:

HS 4
HT 1/2

start fill 3000 psi
end fill 2000 psi

               Statistics/Velocity Report

               String #:     1
          High Velocity:     730
           Low Velocity:     700

       Average Velocity:     716
         Extreme Spread:     30
     Standard Deviation:     9
                 Grains:     32.4  Eun Jins


          Velocity #        Velocity         Power Factor         Foot/Lbs
                  1              700               22.680           35.249
                  2              705               22.842           35.754
                  3              711               23.036           36.365

                  4              717               23.231           36.982
                  5              716               23.198           36.878
                  6              721               23.360           37.395
                  7              726               23.522           37.916
                  8              723               23.425           37.603

                  9              730               23.652           38.335
                 10              730               23.652           38.335
                 11              727               23.555           38.020
                 12              721               23.360           37.395
                 13              716               23.198           36.878

                 14              718               23.263           37.085
                 15              708               22.939           36.059
                 16              700               22.680           35.249

[msurf]

Awesome...what kind of mods did you do on the valves?

[screwwork]

Freaking nice Prods Tefloncoated
I would like to see the video/photos of the making of the bottle Prod.
Did you cut your Prod receiver down or did you send it out to a machine shop?

Randy

[tefloncoated]

Hey thanks guys! I appreciate the good words

Here is a short picture video of the install process:



I'll take some pics of the modified Prod valve next to a stock one and describe all the mods.... Although they're pretty standard - opening up the airflow and volume to the max where it's possible

[scottyhazzard]

Nicely done! Cool idea using the tape to mark the drill sites.

[screwwork]

That was a really nice video, thanks for sharing the how to process.
Looks like I need to buy some more stuff for my Prod now 

[tefloncoated]

A few pics of the stock Prod valve compared to the one that is capable of 38fpe:

[FuzzyGrub]

What size did you open the barrel upto?  I was looking to use my 1/2" reamer, but looks like that will open up to the two breech screw holes.    Other drill sizes would be appreciated as well.  Thx.