Has anyone power tuned their benjamin marauder .22 for heavy slugs I've got the hammer and spring maxed out and vms screw all the way out and the stock valve modded took out the return spring and end cap

Hello All,
just installed Slug power kit, Tung Hammer, power hammer spring on my FX M3, i believe i've done something wrong with the assembly but i don't know what exactly.
now the power wheel adjuster is working in reverse, Velocity increase when i drop from 16 to 1, in other words the highest Velocity now is on 1.
would like to Pin point the issues if someone has faced the same issue before and how to fix it.
thanks.
much appreciate the help

If I add a larger plenum what else do I need to change/add to the gun?

Hello Folks, I'm having a problem regarding the LCS SK-19 which I had bought about 9 months ago while visiting the U.S, but I had to dismantle it in order to transport it back home. I can reassemble it otherwise, but there's a part from the trigger system specifically that I can't seem to remember where it goes and in all of the videos that I've checked online, I don't see it in any of them. I reached out to a few companies for help and got nothing, I even reached out to LCS via email and haven't gotten a response yet. I recently reached out to a Youtuber and he suggested that I try out this forum for answers, so please, please any help would be appreciated. I'm practically begging at this point, because it's a brand new gun and I haven't gotten to use it yet. The part that is giving me trouble is No.1 in the picture below. I know where the parts under No. 2 goes, it's Just No. 1 that's the issue.

I have the vortex spring kit in my Mark 3 and I'm getting about 660-ish feet per second with 16gr pellets... is there anybody else that offers a kit that can get me up around 800 + ft per second? Anybody out there with any tips or tricks or I can up the foot pounds in this baby?

want a hard hitting .30 that doesnt require a ton of tuning and can shoot slugs well out of the box (900-1000 fps). feedback welcome. thanks in advance

My marauder valve stem was bent and wouldn't seal so I ordered a new valve stem but noticed there's a little scratch and knick inside the valve body is it still okay and will it leak?

What's the most accurate slugs for a .22 marauder currently I'm power tuning mine taking the return spring and end Cap out the valve and maxing out the hammer and spring and vms screw

I shoot an unregulated USFT (Hunter #150) in 25 meter heavy varmint (20 FPE max) benchrest.

I can regularly shoot 247+ cards but occasionally I’ll get shots that are 2 to 3 mm high or low which prevent scoring a 250. I’ve traced the problem to variations in muzzle velocity. The POI on the y-axis on average goes up/down 0.17 mm for each FPS swing in muzzle velocity. (This is in line with predictions by Strelok and Chairgun.) Even with tethering to keep reservoir pressure constant, across 60 shots, I can often see an extreme spread of 35 FPS (with SD of 8-10) which implies a y-axis range of 6 mm which is not good for scores.

I’ve tried changing poppets and hammer springs, but I don’t get much change in FPS spread. I wonder if the issue is friction in the trigger mechanism or Hammer spring guide.

This leads me to several questions:


Hoping some of you USFT folks can provide guidance on this problem.

Follow-up: Tim McMurray got back to me. To minimize ES, he recommends maximizing hammer spring tension and using the transfer port restrictor to adjust to desired muzzle velocity. Less hammer spring travel reduces the effect of drag which can vary from shot to shot.

I followed his guidance and based on tethered shot strings of 100+ shots, the standard deviation of muzzle velocity fell from 8.1 FPS with the hammer spring adjuster set 6 turns back from max and no transfer port restrictor, to 4.6 FPS with the hammer spring adjuster set 1 turn from max and the transfer port restrictor closed enough to achieve target velocity. Spreads have tightened significantly as a result of more consistent muzzle velocities.

What airguns out there would you all like to see some good aftermarket mags for? I'm currently working on the AEA HP/SF lines in all 3 calibers and a couple sizes, but after that I'm looking for my next big project.

If you can't think of mag ideas I'm open to other 3d printed accessory ideas.

So far on my research further list
Hatsan Jet 1/2 and 3 if its compatable with the others
Air Venturi Avenger
JTS Airacuda specifically single shot tray
Red Panda
Macavity MA2
AEA Challenger
Air Arms S410/S510

If I ever see a mag for it in the wild I'll attempt
Bantan Brocock XR
Daystate Revere

Does anyone know what style/type of threads Hatsan uses on there airguns?

Are there any PCP rifles that come with a plenum bleed valve (knob or whatever) that would allow the shooter to bleed off excess plenum pressure for those times when the plenum pressure is above the reg setting?

You guys know how the plenum pressure goes up when the ambient temperature goes up -- like you take a shot when it's 60 degrees F and a few hours later you want to take a shot, but the plenum pressure is above your set regulator pressure because the outside temp is now 75 degrees F and the sun came out. You know your shot is going to be low FPS because of the high plenum pressure. So what do you do? If there was a bleed valve on the plenum, you could let a small amount of air out of the plenum and let the regulator bring the plenum pressure back up to normal and then take the shot.

So back to the main question -- are there any PCP rifles that come with a plenum bleed valve?

stovepipe

I want to switch to PCP airguns and I don’t know anything about physics surrounding their cylinders.

Can I use a Bosch EasyPump with these specifications to fill it or it will take too long or even damage the cylinder of a kral mortal x ?

Specs:
Battery voltage 3.6 V
Max. Ah 3 Ah
Max. pressure 10,30 bar
Max. pressure 150 psi
Max. pressure 1.030 kPa
Max. output volume 10 l/min
Hose length 0,2 m
Tool dimensions (L x W x H) 265 x 123 x 87 mm
Weight 0,430 kg

(photos of the pump attached)
I just want to avoid having to carry big air cylinders around or use manual pumps if possible (ME SO LAZY )

hey guys , i got my first experimental barrel to machine for my P15 . it is an unchoked 12 groove, one side of the barrel is Stamped and chamfered and the other is rough cut with a hand saw. which one is the breech and which is the muzzle? many thanks

How do you send PMs?

I have the M3 and I was wondering if there is a way to remove the top picatinny rail (it looks like two screw are holding it) and mount some 3rd party rail that is low profile, so the scope can get a good half an inch closer to the barrel. Has any of you guys done this? If so please post some pictures and links. Thanks!

Has anyone fitted the hm1000x with a Huma regulator? If so, what changes did you notice? And does it come with a valve pin.? Thanks guys. I’m curious to know

I apologize in advance if this has been asked before. I am wondering if anyone has ripped any slugs out of the .177 barra yet. I have zero experience with pcp airguns and just recently purchased an 1100z and am curious if it will shoot them well or not. I live in montana and the with is pretty wild here so I am needing something that can cut through the wind while I am doing some pest control on some ground squirrels. Any input would be appreciated and again, I am sorry if this has already been discussed before.

Hello all! Im kinda new to the group. I sure do appreciate the huge amount of knowledge there is here! My question is really simple. And first off, I do not mean any harm/ disrespect to Hector Medina in any way at all. I recently purchased a Gamo Swarm Magnum in .22 cal. For pests at my home. Almost immediately dealt with scope issues. So I purchased the zero recoil scope mount (the chinese version). I noticed the amount of play in the rails, and read most all threads on "pinning" the rails with grub screws. So...I started the modification of mine. Drilled, and tapped out corners for 4mm teflon grub screws. Does this resemble in any way the way Hector has done his?

Does anyone know if the discovery ht 24x40 scope has zero stop??

I recently purchased the Huma-Air Tuning Regulator as well as the bottle adapter so I can run a larger bottle with M18X1.5 threads. I picked up a 480cc used Daystate bottle and the max fill pressure is 250 bar not 300bar. I double and triple checked that I installed the Huma-Air regulator correctly. At first I hadn't looked up the fitment instruction but after doing so it fixed the leak buy adding the oring that it did not come with but is on the stem of the AGT reg. I had my factory reg turned up, as well as a little cheat for a heavier Hammer spring by preloading the spring with the appropriate sized washers. Went from shooting light weight and I mean very light weight .22 pellets too. After making those adjustments to the stock regulator and the hammer spring I was easily shooting the .22cal 22gr XL-HP Varmint knockers easily over 1000fps. But there is a price for that high power tune. The Vixen does have a 300bar fill, however I believe the CF bottle is only 200cc. So you're just using up air so incredibly fast, and I'm maybe a month away from buying a compressor that will fill my bottles. So I went ahead and purchased the Huma-Air Tuning Regulator for the Vixen as well as the bottle adapter which allows you to put any bottle on that has the standard M18X1.5 Threads. I replaced all of the orings I could manage to find in the area where the bottle connects to the gun and throughout the part that holds the regulator. The Huma-Air regulator will not work in my Huma-Air regulator tester, not sure if it's a size thing or if I can't test Regulators that small. Before doing any of this the gun was shooting 1000fps plus no problem. Now it's twice if not 3 times as loud, went from 1000fps to 700fps. There is a small hole under the regulator housing. That's where it was originally leaking air from before I added the oring to the stem of the regulator. I have to completely de gas the gun each time I make an adjustment, which wouldn't be much trouble if I had a compressor already. Couldn't tell if perhaps I had turned up the Huma reg too high and the hammer wasn't smacking the value with enough force so I turned it down from 160 to 145 and the issue remained, fps dropped to 600 and it was still very loud. Mine is set up as a left handed cocking. My AGT Uragan King in .30cal is left handed as well as my RTI P3 .22CAL. Anyhow, the Vixen is not a Bullpup like the rest of my PCP'S and the cocking lever is next to the magazine well. I can feel a rather large amount of air coming out of where the magazine slots in. It never did that before. Lastly to make sure it wasn't the huma regulator I installed my stock AGT regulator in there and tested it again and it did the same exact thing. Also it was leaking from the small hole in bottom of the part which houses the regulator but it was extremely slow. I am running out of any solutions, I love my AGT Vixen and I would greatly appreciate any helpful input or suggestions. I appologise for the super long story and greatly appreciate those of you who took the time to read this monster lol. You can email me personally as [email protected] or feel free to call or text me at 480-823-2732. Thank you so very much! Looking forward to hearing from you guys!

I recently picked up a Daisy 790 in pieces and decided to put it back together this afternoon. A previous owner had replaced some of the seals, but left the original exhaust valve and small o-ring in the piercing assembly. Once everything was cleaned, lubricated and all new seals and valve installed, it works just fine. Results from a string across my chrono showed 446 fps average for five shots, with an SD of 2. This muzzle velocity was measured while the pistol was on the lowest adjustable setting, and matches the figures put out by Daisy.



This pistol was made mid 1981. so it's still more S&W than Daisy. That said, there are some Daisy differences I thought I'd point out for others working on these pistols.




Daisy changed out the trigger spring and added a plastic seat (visible under the tip of the exhaust valve. This isn't the drop safe trigger they would eventually changed to, but it does increase pull weight to about 5 lbs.



The hammer spring is quite a bit longer than a typical 78g spring. No doubt this it the main reason for the increase in velocity over a standard 79g. The factory service manual advises that original springs in Smith and earlier daisy pistols should have their hammer spring replaced to the new longer one.



Every 1981 780 and 790 made after the first batch (which were just rebranded Smith pistols) has a loading trough that was reamed oversized. This results in more slop in the bolt which requires more attention while loading than on Smith pistols.

Hi everyone,

I just bought an Omega HP3 valve, but it arrived without any branded packaging, only the delivery box. It looks slightly used with some scratches and fingerprints, which is frustrating since I paid for a new one.

The gauge says "Hydro Tech," but I’ve seen other HP3 valves with Omega brand gauges. Is the Hydro Tech gauge standard for this valve, or is it from a different model?

I also can’t find any unboxing videos or info about what the new HP3 valve packaging looks like. Does anyone know?

I want to get more info before making a formal complaint. I’m concerned about using a possibly used valve with my high-pressure tank (9L).

Thanks for your help!