I picked up an altaros booster (B2B edition) with the intent of running it into a regulator and shooting at 300bar or more. A bottle only lasts a few shots at those pressures... even my big 12L bottle isn't enough. It eventually worked out but it took a handful of modifications to the booster.

I found out pretty quickly that it was not intended to do what I wanted. The pump is controlled by a 5 port valve that toggles the pump back and forth. If there is air and electricity supplied, the valve will continue to toggle until it is disabled by the pressure switch. The problem is that the pump doesn't stop operating at the moment the switch activates... instead it will finish the final stroke of the pump and then stop. This causes the burst disk to blow if you hook up a regulator on the output. Of course it works fine if you use it as intended, by pumping from one bottle to another, but the a regulator will stop the flow in it's tracks even if the pump still has more to go before it stops.

I solved this by shutting down the driving air supply at the moment the set pressure is reached. This required an additional valve, a 3 port. First I tried a small 1/8 valve but the flow was too little and the pump wouldn't operate, hence the bulky 1/4" valve.



The original pressure switch also posed a problem. The hysterisis (difference between set and reset point) was huge, around 75bar. In order to operate my reg at 300bar I would have had 75 bar pressure swings on the input to the reg, from 325 to 400 bar. Too much... and the original switch didn't even go that high... so I shopped around and found a nice switch at automation direct. With independently adjustable set and reset points, and can operate at 12v it was perfect.



I wired this all up and used a power splitter to supply all of the electrnics from the usb-to-12v adapter cable. Fortunately the cable puts out just enough current to run all of the components from a usb power bank.

I made one more minor mod. It originally came with a piece of silicone tubing after the internal regulator (for dropping 300bar down to 120psi for operation of the pump). The tubing was there to burst like a fuse if the regulator were to fail. This tube had a very small bore causing a restriction, so I replaced it with a larger tube and installed an actual pressure relief valve.

This took about a month to put together... between shopping for different items, buying items with the wrong threads, finding unusual components etc. In the end it works flawlessly, and it's portable. I've got a small duffel bag on the way for easy transport to the range.

Side note.... fittings for this stuff is a major PAIN. China uses metric threads, everyone uses BSPT and BSPP sometimes, and the US uses NPT. Some use a face seal, some use a sealing washer, some use thread sealant, and nothing ever matches the fittings you have on hand. Major pain. Even best fittings only occasionally has what I need. In the end I got it all together but it took a few orders and 2 returns on amazon for mislabeled threads!


Will post a video next time I fire it up.

Not sure when or even if I'll make my new ballistic solver public, as most people already have their preference, but wanted to show off the work I put in this last week developing one that uses G1, GA, GA2, RA4, SLG0, SLG1, WC0, G7, and some other drag references, while also receiving input on what could or should be added if its not present already. Its a common 3DOF(+) ballistic solver using Euler's method to calculate drag. Nothing too fancy, was/is mostly a challenge to myself and to help myself understand some of the dynamics going on externally with projectiles during flight, all this and I have barely scratched the surface. The math involved for advanced ballistics is...certainly beyond me...but hey, don't let that set you back, I certainly didn't let it to me.


Below are a few screenshots, left side shows no effects added, while the right side shows all effects added, Spin drift, Magnus effect, Earth based effects which include Coriolis and Eotvos effect, and even the wind being included in zero, a feature I figured would hurt to add that I don't see currently in ballistic solvers. These effects are near meaningless under 200 yards, but really present themselves, more-so with airguns, once pushed beyond.

No added effects vs added effects



Spin drift, Earth based and Magnus effects=.09 / .32 mil at 150 yards = .5" and 1.75" difference, while not a lot, it grows rather quickly as you increase range, which airgunners are frequently doing as technology evolves. .08 of the .32 was the wind being zeroed, still 1.3" with that effect taken out.

The other cool feature is visually showing the vertical stringing. The FPS variance above is 50, and you can see on the reticle, horizontal lines that show where your high and low shots could wander to assuming your fps input used is in the middle. At 50 fps spread you could see upwards of 7" of vertical stringing in the above setup. 50 fps spread was used to show the extreme, as no one in their right mind will shoot 150 yards with a gun that has 50 fps spread, at least not out of enjoyment.


VS 20 fps spread which is calculated to cause roughly 2.6" vertical stringing. (Not shown, 5 fps is .6" vertical spread, at this distance with this setup, and 10 fps is 1.3")



Another neat feature is automatically updating weather that effects your shot. Each component from Temp, humidity, wind speed and wind direction can be set to auto or inputted manually. Its wild to see the effects here in Colorado as the temperature goes from 40F in the morning to 90F in the afternoon. Quite the shift in POA required.

Here is 40F vs 90F:




.52 mil + .23 mil which is quite a shift, and that assumes your gun isn't shooting at a greatly reduced fps in the cold, which it likely is, which would add even more drop.

If you have ideas / features that should be included, feel free to chime in! Happy shooting.

-Matt

Hello, I'm wondering if anyone has tried AAO SUPER VALVE with the heavy hammer and magnum spring? If so I'd love to hear about your findings. I have a LSS and an SS in .457. Information on either rifle with the AAO setup would be greatly appreciated. Thanks

Hello I'm new to this forum . I'm trying to learn more about my R9 Beeman .20. From what I've seen this German made R9 appears to be somewhat rare? Any info and idea of its value would be great. Thank you.

I had a great time going out on public lands to go squirrel hunting! This was my 3rd or 4th time going out but my first time being successful this year. The success rate is completely connect to the acorn yield, so what may have been a hot spot a few years ago, can dry up completely the next year or so.



After walking about a mile, I came across some deer scat amongst some acorns, which was a good sign that there was food that squirrels would take a liking to. 20 minutes after my first still, I decided to press forward some 50 yards for another still and I saw some movement. My camo did a great job, as he had not a clue I was there even at 26 yards!

Anyone put a cheek riser on the stock notos? Is there any cheek raiser that will fit on the stock notos? Didn't want to purchase a new magpul stock and cheek rise. Was wondering if I can just purchase an cheek riser and use on the stock notos. Let me know if the one of the magpul will fit or any out there will fit on stock notos.

Hey guys

I have a modded normal Avenger. 22 that just made "full auto" noises like when a paintball gun or CO2 airgun are on last bits of air... went brrrrrrr like shot real fast back to back to back and watched the needles drop then rise again when it was done.

It has a light valve poppet spring and some other stuff done to it but it has stock hammer spring set at 4 turns I think.

Any idea what could cause this on a side lever gun? It did it twice in a magazine but not back to back.

Need new poppet or something? I didn't mess with hammer spring or regulator but did recently have to degas to replace an O ring on the plug for the bottle conversion. No idea why that would matter but just giving more info.

Thanks in advance!

$1000

I have a huban gk1 in 25 caliber I would like to sell or trade for a Corbin slug press.

Thanks
Brandan

Absolute mint Edgun R3M .22 and stippled grip for way better feel. Comes with 2 mags,soft case and fill probe. Not a thing wrong with this gun. Cycles fine and no leaks.
$600 Need to sell to buy a Huben.
225-301-8575

I took my HPC .25 out today to site in a changed scope. I noticed that my POI was quite a bit lower than I expected. So I put the chrony on it and to my surprise it was going at 685 FPS where it had been going at 860! No air leaking that I could tell, but I’ll let it sit. I then upped the regulator pressure from 130 to 150 bar and the FPS went to 714. I moved the hammer spring between 3.5 and 4 with no effect. Since this is my first and only FX, I’m at a loss as to what caused the drop. It’s been rock solid up to now. Is there an o-ring that may have gone out that I need to look for? The gun is clearly quieter now than normal. Any help is appreciated.

The fx impact is the only gun that release a different model 1-2 years apart. It is the pcp airgun of Samsung and Apple phones lol. So the question is, buy the impact m4 now or wait 1-2 year for the m5? What features do you want to see in the m5?

Fx impact
Fx impact X
Fx impact mk2
Fx impact m3
Fx impact m4
Fx impact m5?? Maybe 2025-2026.

Hello I'm a first time lurker , I recently went to a range where a Air rifle club was shooting and I really enjoyed NOT heraing the Bang..
Those guys were having so much fun.
I inquired about one of the guys guns that was there and he offered to sell me one of his . It is a Virgin Model 54 with no scope .
It has a maple stock and by the pictures looks pretty good he said it was around a 2008 -10
I would like to know what they are worth this one looks like a 8 out of a 10 maybe .
If thats not a good brand what would be a good starter?

Taipan Veteran Tactical 2 - 5.5mm
Origenal condition as from factory

Incl are.
2 x Magazine,s
Single load tray & hammer adjuster pins

Very very accurate wiyh slugs and pellets.
Shooting the Redesigne JSB 25.398 @ 960
With 22 gr slugs it is crazy accurate

$ 965 Byer pays shipping

Text
806 566 7190.

Willing to trade for smaller bullpup/compact.

Selling my .25cal BRK Ghost that is in excellent condition. The gun is currently tuned for 25.4 grain pellets at 910 FPS and shoots them very well. Comes with PRS rail and bag rider. If you have any questions shoot me a DM. $1700 shipped. PayPal. No trades.

I have an original 46M, unaltered grips.
Actually I have 2.
One I've modified and shoot winter air gun league with it.
So question do I keep #2 or move it along. Can't come up with a good reason to keep it.

Purchased in June 2024, one of the last new ones that was available in the original version. Absolutely great shooting airgun, I've just got three airguns that shoot very similarly and something needs to go. Still not sure this is the right choice. Cocking lever is on the left side, I'll swap it over to the right if the buyer prefers. I've added the DFL hammer spring adjuster and a picatinny rail. Shoots JSB's 18.1's in the mid 880's fps and gets around 80 shots. Scope, rings and laser are not included.
$1000 shipped Pay Pal Friends & Family or buyer pays fee.

Air Arms S400 Classic .177 easily tuned to sub 12 or for HFT,
Upgrades:
-Rowan stripper,
-BestFittings quick Foster fill,
-Rowan Trigger
_BestFittings Threaded Muzzle adapter
-will include original muzzle brake and Custom TKO shorty Moderator.
-Aeron Stock
-MPR-FT stock
-Original S400 Classic Stock

$1700 $1500 $1300 $1100 for complete package,(3 DIFFERENT STOCKS INCLUDED.. FIELD TARGET, HUNTER FIELD TARGET, AND PLINKER/SQUIRREL HUNTER..YOU CHOOSE YOUR CONFIGURATION) will throw in Scope, rings and base shown (Swat 10-32x-56) in MPR-FT mode. Hamster and moderator shown in Aeron Stock mode not included. PACKAGE DEAL, NOT SEPARATING AT THIS TIME. $1700 $1500 $1300 $1100, my loss your gain..

Prefer peer to peer direct payment otherwise Buyer pays PP fees, Buyer pays Shipping

Dated 2019 this is a current model still available for order for 1849.00 from Pyramyd air and others. I purchased this one from AOA a while back, it had a crack at the wrist from shipping, it was still secured by the trigger guard which is part of the stock and was actually a little difficult to get the crack opened enough to get 30 minute epoxy to completely flow and coat the entire crack. After it was dry I added 2 U.S. government surplus threaded brass stock repair pins coated and back filled with the same epoxy. The repair is barely noticeable and is the strongest part of the stock. Other than the stock repair the gun is excellent and has seen little use. Has a nick under the stock which is pictured. Typical FWB accuracy and a quiet grenade launcher sound from the shorter than shroud Barrel. Holds air forever as I have never seen any evidence of loss. Includes the pictured 5 10mm butt plate spacers which sell for $20 each, the fill adapter and manual with factory test group. Will be shipped separated from the stock to keep costs down. 750.00 shipped 48 states. PayPal friends and family or add 3.5%.

Having completed many many successful buying and selling transactions using AGN's classified section, I thought it would be nice to create a thread devoted to my Lessons Learned that I feel are most valuable:

#1) always create a proper bill of sale and record your purchases and sales to include historical info like:
date and source of acquisition and take pictures that include:

A) serial numbers
B) identifying features.

How many of us do this? Thus the value of the information.

#2) If you are going to sell high dollar items, clearly identify what the item is and make sure to include a serial number(s) when applicable.

****Include a bill of sale and an additional shipping label on the inside box*****

#3) Only ship properly (double boxed and extremely well packaged) items that make it very difficult for a carrier to peak inside. Find ways to stiffen the boxes against being bent or crushed. I recently had a brand new Redwolf arrive with a bent barrel and cracked barrel shroud because the shipper failed to stiffen the inner to outer packaging method.

#4) Properly and truthfully declare package contents and fully insure them so that you can actually be refunded in case of carrier loss. At the very least, use the item your shipping legal nomenclature on shipping documents without trying to be sly by using terms like pneumatic tool or paper puncher or whatever. If you are trying to save a nickel you are likely to loose many dollars.

#5) always require a "signature on the receiving end" to avoid a porch pirate or worse an thieving delivery person.

#6) If an item is lost / or suspected of being stolen, immediately contact the carrier and provide all your documentation, time is of the essence - there is always a waiting period before you can file a claim.

#7) After the waiting period is lapsed and the carrier declares the loss, file a police report, as a police report provides a clear legal documentation of the circumstances surrounding the incident and your desire to recover your property.

#8) Be Fully aware of what is and isn't insurable and thus financially recoverable - an example: if you use Pirate Shipping, a third party discount shipper - they state in their rules that Airguns are not covered by their insurance. You need to know exactly what UPS / FEDEX / USPS will actually allow and insure.

#9) as sellers and buyers be VERY clear of what you will do in case of loss or damage.

#10) be kind enough to leave feedback for one another.

#11) be ever alert to the scammers.... they are getting good at stealing photos from a variety of sources. Vet them fully and if needed have them share a picture of a drivers license, a snail mail address that you can look up, email. Remember the more info you get up front, the less likely you are to be scammed. Recently the only way i avoided a 2K scam was because when something felt off... i said i wanted to pick the gun up in person and pay in cash.. at that point lots of reasons why that wasn't possible started flying and the scammer was outed.

I encourage AGN members to add more lessons learned to this thread; but keep them as factual information, not just hearsay.
The Classified Section of this forum is a valuable way to buy, sell, and trade things which can help us all enjoy our sport more.

I also encourage you to visit this thread regarding shipping:

So I've been getting tons of coyotes around my property that have no regard for my dogs or myself earlier today one was out watching my chickens within 20 yards . I have some rolling hills and dense brush out side my property line so anything over 75 yards and won't be able to get a clear shot . I currently have a .25 cal hansan 95 vortex that I use for ground squirrels but don't think it's strong enough for coyotes. So looking for a new rifle that i can reliably use thinking .30 or .357 what would yall recommend? Would like to stay under 600 bucks

My Crown was originally a 25cal and now sports a 22cal barrel. I was thinking of buying a 177cal barrel for it but don't remember reading anything good about FX and 177cal. Has anyone used the 177cal kit with decent results?

Couldn't resist buying yet another R8....this makes 4 total. Unfortunately, this one is a little bit sad. Looks great, but the pellet doesn't even make it to the target at 20 yards.
Fortunately, I have tons of spares for it thanks to last year's R8 hoard purchase. I'm going to see if I can get it going again with some help from my fellow airgunner from Pellets and Pistons...Kevin. Hopefully he has time for me.
In the meantime, here's a couple if pics for your perusal.

Do the single gauge 303's perform well with 50.15's or other heavy pellets.? Not looking for a slugger . Just curious how it does at 75-100 with 50.15 or similar..ZAN etc They look fairly robust.

Ok, I've almost got this gun figured out except one thing, the hammer adjuster.
Within eact setting of the macro, 1 thru 16, is there also 5 micro increments within the macro?

In other words, is there macro 1.1, 1.2, 1.3 ans 2.1, 2.2 etc up to 16.5

Or if I reset the micro to 3, for instance, on any of 1 thru 16, is that the same setting?