Tuning Benjamin Wood Walker PCP Pistols - tunable?

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jdanvers

jdanvers

Member
Jul 7, 2019
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South Central Upstate NY, United States
Readers digest -- I've got a barn permission with LOTS ( and I mean LOTS ) of pigeons. In one section of this barn they are so close ( rafters are low ) that I can't even focus on them with the scope my little Taipan .177 - scope focuses down to 10 yards ... they're inside of 10. A friend of mine has a woods walker that he is going to let me borrow / look at - I'm going to ask him if he minds if I tune (de-tune) it some - I'm 99% sure he has never done anything with it tune-wise - he just shoots it, and not very often at that.

For those of you who know this gun:

Does it have the infamous 'lawyer spring' at the trigger like the m-rods? Can the trigger be tuned - made light(er).

It's basically an m-rod in a pistol form (yes?) - can I assume it has a 1/4" hammer spring adjustment @the rear and I can back off on that?

Ideally I'd like to get it sub-10'ish ft/lbs for popping these pigeons - I've an old tin of crosman 14.3 hollow points @home, plus a couple of tins of jsb 16 and 18's

Thanks guys

-=- jd -=-
 
It's not like the Marauder rifle it has the 1701 gripframe and trigger assembly and the smaller diameter air tube to match so it is more like a carbine model that gun. It has an adjustable trigger and if you polish it up and adjust it right it can be quite decent.

As far as any other tuning there is the hammer spring as you mention and it can easily be adjusted but that will affect your accuracy greatly as will your pellet choice.

Huma makes a reg for them I just put one in my Ratgun which is very similar to the Prod. That would give you more tuning abilities but limit your max power output slightly. It would give you more shots and great shot consistency. 

Not your gun and they run $125 so you probly want your own before you do that.

For lower power on an otherwise stock gun you can put a smaller T-port in it or try a slightly lighter hammer spring although you don't want to go to light as you will have problems with valve lock at higher pressures.

The only other tuning ability you have with the gun is varying the fill pressure so you get the best curve and the greatest number of usefull shots. This will be at a lower pressure than the max fill pressure.
 
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So I got this thing home tonight after work and did a quick little bit of testing with it. A lotta pigeons are gonna be finding their way into pigeon heaven tomorrow. It took me a little bit to get used to it (the tribger on it is nowhere near as nice as my Taipan . . . but once I developed a feel for it and figured out where it was hitting - I zeroed it at 10 (lol) and then shot it at 15 which is about the furthest some of those pigeons will be, and then I brought it back to 6 or 7 yards just for the heck of it. I've got a vertical spread of maybe an inch or so across that range. I figure I'll just put cross-hairs on the top of the chest - it hits high it'll be a head shot, low it'll be center mass.

Readers digest -- I gotta get me one. This things cool. :)
 
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I would leave it as is, stock tune is around 650 fps, you should be good and I highly recommend getting one, they're very fun.

here's mine not a walker but very awesome little gun

Prod modified.1630456411.jpg

 
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😁 lol ... I just bought the marauder pistol over at PA - I can't find the camo ( or any for that matter ) woods walkers anyplace. I'm thinking this m-rod is more or less the same thing and yes - from the very little bit of play that I had with it in the back yard earlier before it got dark - yes - I'm thinking this will be a fun little gun! I grabbed the pistol, three extra magazines and a little bug buster scope and some medium height dovetail scope mounts. Supposedly be here by Friday. 😁
 
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One of my favorite guns. The o ring mod works very well to eliminate bounce. I forget the name, so i call it the stale pastry mod because it sounds similar. Look up the A-team tuning for marauder. The pistol’s adjustment range is not quite the same as an m-rod, but the concept is. Hex is same for the striker but smaller than the mrod. Few other things: Trigger can be lightened a-lot (1oz or less) , sear polished, spring tempered. Graphite lube on the hammer works very well and a buff or polish of thr tube area wont hurt either. Once you find the best shroud position, mark it. One of mine likes a finger tight shroud, another likes it backed off 1/2 turn. 


Heres two strings of one of my p-rods i keep in all stock format. String 1 is 100% out of the box. String 2 was just a baseline reading for hammer spring 6/ throw 2 and taken after a 200 shot break in period, clean, grease and rebuild. Might give you some sort of reference point of what the gun does at a higher vs stock setting, note the ammo was different. Shots 1-4 are also missing from the 2nd string, FX chrony missed them.

Note, chrony has been calibrated now so these readings were actually low by 1.8 % back then..

Notes: PRod stock, AA field 3k to 1.5k

Shot count: 42
Low: 540
Hi: 609
Avg: 583
Spread: 69
STD Dev: 19.6
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Notes: 1-4 missing cphp 14.3gr HS 6 HT 2 

Shot count: 28
Low: 605
Hi: 663
Avg: 644
Spread: 58
STD Dev: 15.2
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I do have a Huma reg in another setup, but 
regulated is not really needed IMO for the pistol as you can tune a stock p-rod to a pretty tight ES without one. For a reg setup you should be changing your springs for best performance as well. You also would want to then remove the gauge block for more air. The gains vs plenum and tube space are not really there for most uses, but has its place for sure. My regulated pistol is an ongoing project, setup for FT Open class, all ports at .140”, CF wrapped lw barrel, hill springs, custom trigger shoe, unicorn bone breech screws, blah blah blah, BUT pushes pellets right at 874 fps with an ES of .9, same hole group at 36, 1/4” at 55. Shot count is only 7 on reg, so theres a big trade off, along with the $. 



 
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Check it out - my p-rod finally showed up. I got 'er tuned, barrel cleaned and sighted in. Looking around the house for some sort of storage to put it in when I toss it into the car ( when headed off to the farms ) it occurs to me - "Hey . . . I wonder if this little thing will fit in the equally little RTI hard shell case?"

I finally have a use for that ( dinky and more or less useless - lol ) case that one gets with those guns. :)

p-rod_in_RTI_hardshell_case.1631058567.jpg

 
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