My buddy has one. It quit spitting pllets. 177 any ideas where to start? Cleaned the barrel, had 5 stuck but now won't do anything.

We are currently investigating the recoil energy and recoil velocity of mainstream airguns. If you have relevant information or data, please let me know. Thanks！

I'm looking for a replacement aftermarket piston seal for the JTS portable compressor, does anyone know the exact size needed for this compressor and recommend a place to purchase from?

I know I could try to contact JTS but I really don't want to deal with them if I don't have to.

Nitro-piston rifles can stay cocked for some time without damaging the ram. Now a spring being
compressed longer will get damaged. When out hunting, do owners of a springgun wait for the
time to shoot and then load?? Oportunities may not last., cocking the gun makes noise.
Just wondering

Hey all, I am looking for info on a challenger arms plainsman. It is missing parts and the pump is stuck. How much is it worth? Can I find any parts for it? It's 22 cal and any help is appreciated. Thanks!

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

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?