Calling all 25 cal marauder REGULATED guns

[Dairyboy]

I wasn't sure myself but they are interchangeable Tim.

[fishcowboy]

What the *(&^ happened? I just woke up realizing that I have 17 airguns. Two years ago I had 1 "760"!
My G2 Srod got 14 shots out of the box-not good enuf.  After much research (thankyou), I went to work on the gun.
10# spring, 6" air tube ext., white o-rings, curved trigger,  de-pinger, Huma reg @ 2200.  No milling or drilling (I am a machinst).  Fill 3100, 25g kings, annnd this gives me 32 shots (920-880) at 75yds with 1-1/2" group.
My Son has a Ruger 10/22 & I out shoot him with the Mrod (especially when he can't find any bullets for sale!). The Predator & Benjamins shoot fine, but only out to 50yds.    Rich B.

[Ozarkairgunner]

Hey guys, starting to wonder what I'm doing wrong here, after getting my new sear in and fixing the trigger issue I'm back up and running, had a few problems trying to get my popet to seat in the valve, but after putting a small oring around the valve stem that problem was fixed, but I'm only getting about 19 good shots before I fall off the reg and they're all in the 740fps range, a little slower than what I wanted. Reg is set at almost 2000psi. What am I doing wrong?

[Dairyboy]

What's all done to your gun?

[Ozarkairgunner]

Mostly still as close to stock as possible I did bore out the transfer port slightly to the 3/16" and closed my gap, don't know the exact length, and slightly increased my preload.

[shorty]

CJ,
If you only bored out the transfer port sleeve, your gonna need some more work.

You will need a WAR valve, Hill valve, or port your exiting valve to have a minimum of .17" exit port.
Then the transfer port sleeve (which it sounds like you have that covered ).
and lastly
Drill the barrel port to match TP and exit of valve.

Power should be there then and if you don't get the shot count, go for the SSG or SSS for the hammer spring.

[Ozarkairgunner]

I did bore out the sleeve and the stock valve, as well as an additional little bit of work on the valve to allow for just a tad more flume, I didn't drill the barrel, and I have an SSG installed already. But shouldn't I still be getting more shots, even if they are low velocity? Also I've been debating on buying another valve, I just don't have to funds right now, but even with another valve, would I still need to enlarge the port on the barrel?

[Dairyboy]

Yes enlarge the barrel port is a must. If you screwed your gap in that's an issue thats what helps with the efficiency. Wait light bulb you might have reached your power potential with the reg setting without opening the barrel port. First things drill that out to match. Second you might have too much hammer spring at this point and just wasting air. Decrease the gap slightly to where it's just 15fps below your max fps right now and then see what that does

[Ozarkairgunner]

Okay, after I get off this evening I'll drill out the barrel port and debur, and reset my SSG settings and see how things are and try to let you know by tomorrow.

[fishcowboy]

I am "guessing" the o-ring is restricting the amount of air.  Try adjusting the HS & HT.   Also the SSG might be limiting the air.   RB

[Ozarkairgunner]

Okay, update....well I'm getting over 40 shots now off the reg but seem to be maxing out at 36fpe, close but no cigar, I'm going to try increasing the reg up just a bit and see if that gets me there. I thought I had it set closer to 2000, but I'm actually down closer to 1800.

[shorty]

Can't wait to join you to the club. Yup, bump that reg to 2000psi and I think your there.

[Dairyboy]

Can't wait to join you to the club. Yup, bump that reg to 2000psi and I think your there.

+1 

[PBguns]

Can't wait to join you to the club. Yup, bump that reg to 2000psi and I think your there.

+2 (any updates)??

[J M]

Okay fellas I am going to try to join your 40/40 club. I have basically zero experience with PCP mods so going strictly from what I have read here.
I am pretty much ready to order reg.  and associated parts to start the journey!
To date the only mods I have made are WAR SSG and of course clean up debur and polish internals.

A few last decision need to be made before I start ?

I am looking at both Huma and also been studying Robert lane regulators. I am currently leaning towards Lane for the simple reason he also has a reg. made for  the marauder to accommodate the gauge but mostly he has pretty clear dimensioned instructions regarding porting and where and how much to drill and or modify internals which are helpful, I assume they would also apply to Huma but?

Do I also need aftermarket valve, springs and hammer to achieve this tune or can stock parts be used?

Any last words of wisdom before I order would be appreciated?

 

[Ozarkairgunner]

J M, I have done mine as close to stock as possible and it's been a headache, and if done over I'd probably ordered the hill valve and transfer sleeve, but to answer your question, yes it can be done with the stock valve, springs, and hammer. I should also note that I did put a light coat of moly on my hammer to help it hit a bit harder. You will need to modify the valve and barrel by drilling out to 3/16 on the transfer. I'll also be going by the hardware store to see if I can't find something to drop in for a new sleeve that I can use without the orings and get more air moving thru, I'll let y'all know how it goes.

Guys it'll be tomorrow before I have a chance to turn the reg up and let you know how it goes.

[GoneShootn]

Can't wait to hear about it CJ.

I am starting to think nobody really cares about a 40/40 tune "or more" with their 25 cal marauder or if we are pulling their legs on it since it sounds so impossible.

Your gonna love it if it works out for you. If you need anything to get there, I would be more than happy to help.

I can tell you that I've been following, and I care. I remember RayK saying how nice it was to take only his rifle and 5 mags and go hunting, and I thought, that's what I want.

I picked up a Huma reg a couple of weeks ago at a deal I couldn't pass up, or I probably wouldn't have it now. I also have a Hill lightweight hammer and am studying you guys' experience to decide where to go from here.

Also, to those of you already in the club, how about a quick recap of what you did and then maybe post some groups?

Thanks to all for sharing your hard work and success.

[Dairyboy]

No groups past 25yds but here's what mine is doing with a stock barrel. Top groups is 5 shots with polymags, bottom right is 5 with JSB kings bottom left is 5 with AA 25.4 gr. Was shooting minute of sparrow at 75yds the other day. 5 shots and 4 hits only because the miss hit a branch right in front of the bird.

[Sfttailrdr46]

No groups past 25yds but here's what mine is doing with a stock barrel. Top groups is 5 shots with polymags, bottom right is 5 with JSB kings bottom left is 5 with AA 25.4 gr. Was shooting minute of sparrow at 75yds the other day. 5 shots and 4 hits only because the miss hit a branch right in front of the bird.

No surprise there the stock .25 Marauder is excellent and accurate out past 50 yards if the shooter does their part and regulated just makes accurate shooting that much easier with the shot to shot consistency. That's why I hand load all my rifle ammo

[J M]

Parts are ordered, fro the 40/40 mods. I went ahead and went with Huma Reg, and  hill valve, I think I'll play around with turning down my existing hammer, maybe drill some hole thru the flanges to cut the weight.

Anyone know exactly what material ( spec) is best to build a newer lightweight hammer out of, Aluminum? I remember reading about someone using nylon or derilin?