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benjamin Gunnar Butt Stock issue

I know Benjamin markets them as such, but my Gunnar's tube measures fatter than mil spec, and thinner than a commercial spec. This was a gun I picked up directly from Benjamin in December. Maybe Reximex had different suppliers for different runs.

The military spec receiver extension (commonly referred to as buffer tube) diameter for an M4 service rifle is 1.149" +0.000/-0.006 (from a Picatinny Arsenal drawing I got a hold of). Also, the threads on the mil spec extension are proud of the tube. My tube measured at 1.163" and the threads are cut from the tube, and I couldn't get any of my mil spec stocks to slide on (I use Bravo Company USA stocks).

I really wish airgun manufactures were more careful when calling things "mil spec" and instead call them "military style."
Not to mention there are multiple ex marines up at Crosman that demand mil-spec.

JTS  Airacuda Max leak from barrel entry

I have the same problem on my Airacuda Max. I tried contacting the company 2 times and still no resonce.
Does anyone know where I can find instructions on how to fix it myself?
If you had air coming out of the barrel that means that the valve and poppet are not sealing against each other.
I had air coming out the barrel and I had to burnish the valve.

There is an entire thread about that here: https://www.airgunnation.com/threads/jts-airacuda-likes-balloons.1321499/

AirMaks Arms  Caiman MK1 regulator problem

Degassing a Caiman is a function of which version you have. Early ones had a tool that came with the gun that allowed you to depress the valve a little bit (open it) to degass the gun. Mine did not have this tool so I had to contact Utah Airguns who explained why. They put on what I consider a normal degassing screw instead. Getting to it is somewhat involved but once you are there it is pretty simple to degass and adjust the regulator. You have to take both portions of the stock off first. The bottom is a couple screws. The top is held on by tapered pins on early ones but mine has two screws for the top portion too. The scope has to come off to take the top part of the stock off. Another difference is the safety location. Early ones had the safety in the back of the gun but mine is above the trigger. That pin has to come off, however, the safety pin that slides side to side for the lower part of the stock to come off. There are two screws inside the trigger guard that have to be loosened. The smaller one you can access through the trigger guard and it has to be backed off a lot. The larger one is for the tension on the pin and you don't have to loosen it but the pins come out easier if you loosen it like 1/4 turn.

With the stock off, on mine you unclamp the airtube from the rest of the gun. There are two screws at the back of the airtube for this. The degassing screw is under the front one. Open it slowly until air comes out. You may have to loosen it some more to get all the air. Once you are degassed you screw off the back end of the airtube and pull the regulator out. You will need to put a bolt or something into the threaded hole in the regulator to pull it against the O-ring tension holding it in place. I used a tap last time I did this only because it was handy and the right thread. A bolt would be less brittle and therefore a better idea. But you shouldn't have to pull very hard. I don't remember if there is a lock nut but basically you just turn the adjustment screw you will see once the regulator is out. Humas have a paper tape to give approximate settings, I have not seen that on others. 1/4 turn should be safe. To go down, you want to turn clockwise like you would to tighten a normal screw.

It probably sounds more complicated than it is. The only unusual thing is the clamshell stock. I had no instructions the first time I took it off and still got it done.. I assume the first generation Caiman is the same except for no degassing screw on the airtube. I believe the manual has some discussion of how to degass (for the first generation, not the second).

30 minute SCBA tank

My calculator for pcp fills attached, you won't get many fills to 4k from 1,500 psi with only 4200 psi in the tank


1727780147294.png


As you reach 4k in the tank, you'll have to fill around 113~ psi less each fill after the first 1~, and then a partial fill after...and for each fill after that, you'll be able to fill to 3900, 3800, 3700, ect...

With a lower fill pressure, say from 1500 to 3200...

1727780235958.png


and with a bigger tank...

1727780259541.png




-Matt

View attachment PCP Fill Calculator.xlsx

FX  FX Impact M4 - 300 Bar - Needs First Regulator ?

I guess those Zan's at 150bar are going 960-980fps? .33gr .217 or .218?

Las week I orders some .217 33gr zan, seen some threads that day Zan's should go minimum 970fps, top 1040fps....will have to try out to see
Yeah mines running at around 980fps on the above settings with nice tight groups
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Hatsan  This could be one of the best $400 PCP pistols?

I only shoot it at a remote line.
Works perfectly, the position of the foster is well choosen.
I wish they would have put the pressure gauge on the same side as the bolt.. make it better for a holster..if I could find a plug and the correct tap,if move the gauge.
Mark

Umarex  Umarex Canex Co2 Plinker: Not A Peep!

At Shotshow 2024 Umarex unveiled the .177 Canex Co2 carbine repeater. It is a featherweight, claims 600fps with lead pellets. It uses a 10(?) round revolver clip and though it is double action only, claims to have a sub 5lb trigger. (Disabling the prawl and indexing the clip by hand for each shot could make a nice sub 2lb trigger, I'm betting.)
Since then I have watched for it to come into stock and even spoke to Umarex about a possible stock date. Not a peep!
This sounds great. I stumbled onto a 40cnt box of co2 carts in my garage and it has made me decide to get a co2 rifle for the backyard. This umarex canex sounds great! Thanks

FX  Fx trouble shooting

I believe what you are hearing is absolutely normal. Between the regulator and valve in your guns is a space called the plenum. This is the space where the pressure regulated air is stored. When you fire a shot the valve feeds from the plenum to propel the pellet. You are hearing air rushing back into the plenum, refilling it. Not a leak at all.
Thank you very much Trucker3573 for that answer!
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Daystate Wolverine tuning for HFT question

Daystate is notorious for having small action/frame and barrel transfer ports. They've blossomed as of late with the Delta Wolf / Ghost platforms, thank goodness. With proper porting you'd only need 135 bar or so. With what you have from factory, you will need 145 to 150 with your hammer stroke adjustment dialed in.
You certainly did an amazing job on the .25 EFT Wolverine!
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Benjamin  marauder f&t reduced shot count

Over the years my .177 Marauder f&t has gone from 90+ shots down to 60+ using the same amount of air. I noticed it a couple of years ago and suspect hammer bounce since it sounds different from when I first got it. There doesn't seem to be any leaks and the hammer throw and valve are at the original settings; the hammer spring is set lighter than originally. The rifle probably has close to 20000 pellets shot through it. I have replaced the valve and a couple of regulators and most of the seals. Any thing else that I can check?

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