Tuning Artemis P15 Woes

It doesn’t mount on, it mounts in. You take all the metal baffles out of the shroud, take the stock muzzle brake off the barrel, then install their stuff. If your gun is tuned properly and not wasting air, it’s worth every penny. It’s as quiet as anyone should need. I added another grub screw or two in the rear shroud mount on mine. The TJ barrel was slightly smaller diameter than the stock barrel.
 
It doesn’t mount on, it mounts in. You take all the metal baffles out of the shroud, take the stock muzzle brake off the barrel, then install their stuff. If your gun is tuned properly and not wasting air, it’s worth every penny. It’s as quiet as anyone should need. I added another grub screw or two in the rear shroud mount on mine. The TJ barrel was slightly smaller diameter than the stock barrel.

That's good to know. The LW barrel I'm installing is going to be slightly smaller too. I'd prefer to run a shroud since I'm adding some length to both the barrel and air tube with the XL plenum. Adding a moderate would just make this gun extremely long. Still a not as long as my Gauntlet though lol. 
 
My larger plenum is internal and a one piece CNC machined piece. It took up some air space but didn’t make my gun any longer. If I were you I would make one investment at a time with the gun. After the barrel, poppet, spring, plenum and possibly porting job, make sure the gun is worthy of a good shroud kit. You might wind up dumping the gun in the classifieds and most guys will just hang a giant can on the end of it.
 
My larger plenum is internal and a one piece CNC machined piece. It took up some air space but didn’t make my gun any longer. If I were you I would make one investment at a time with the gun. After the barrel, poppet, spring, plenum and possibly porting job, make sure the gun is worthy of a good shroud kit. You might wind up dumping the gun in the classifieds and most guys will just hang a giant can on the end of it.

You are correct about that. Time and money spent will tell what I think of it.
 
What work did you do to the shroud? I hate the look of silencers on these pups.
I like the look on my P35 with an after market silencer...besides, its easy to put out, so it can be transported in a backpack...in reality a snowshoes backpack.
First I dismounted the stock from the rifle, and the handle from the manual pump. These are in the "first level", then a corrugated carton nad over it the barrel and air tank+sight. all of this protected with 1" planks of closed cell foam. With a pair of 250, 5,5mm pellets can weighs a total of 8 kilos/17,6 pounds.

P35 PM Attenuator.jpg


P35 and manual pump in snowshoes bag.jpg


P35 in snowshoes bag.jpg


P35 mochila-para-raquetas-de-nieve-quechua-sh100-negro B.jpg
 
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Well, the plenum was assembled when I received it. There is a piece on the new plenum that looks JUST LIKE the stock plenum (circled in red). Where the spring sits, the new plenum had a smaller I.D. I simply thought that I was battling heavy spring tension and forced it to go together. Like I said, I am dumb lol.

View attachment 122619



I did email the guys in the UK. They want 20GBP for the poppet and 24GBP for shipping, and they do not have the spring in stock. I did think about trying to make a poppet from PEEK using my dremel and sandpaper. However, I have never done something like that, and seeing my track record here, think it could be a risk lol.
 
Well, the plenum was assembled when I received it. There is a piece on the new plenum that looks JUST LIKE the stock plenum (circled in red). Where the spring sits, the new plenum had a smaller I.D. I simply thought that I was battling heavy spring tension and forced it to go together. Like I said, I am dumb lol.

View attachment 122619



I did email the guys in the UK. They want 20GBP for the poppet and 24GBP for shipping, and they do not have the spring in stock. I did think about trying to make a poppet from PEEK using my dremel and sandpaper. However, I have never done something like that, and seeing my track record here, think it could be a risk lol.
I need this full diagram. How could i get this?
 
Good morning everyone. I am a stupid gorilla and ruined my .25 poppet and poppet spring yesterday when trying to install the Xtreme XL plenum. I am hoping to find someone in the states that has spare parts or can make a new poppet valve for me. The only place I've found with available parts is in Greece and they want 50 euros to ship for $5 worth of parts. You can see in the pic how dumb I am. Please don't make me feel worse lol. I have searched all over for spares, and asked on FB and other groups with no success. Help me Obi Wan Kenobi; you're my only hope.



**I am cross posting this on GTA to get maximum help**

View attachment 122577
did you ever sort your poppet valve out mate? I've got the same problem in a way I'm without a poppet lol but this may help as I'm not sure how old this is Ali express sell poppet's but there a bit big if you can sand them and cut them to the required size. here's a few pic's, all i need to know is the size of the poppet, I don't suppose you know that do you by any chance? all the best

IMG_20250812_140800.jpg


IMG_20250812_140751.jpg
 
On souping these things up.
For the 25cal be aware that as you start getting into more serious porting on them for a 25cal you´ll sooner or later "break into water".
Ie; the transfer will end up running into the sealing "shelf" for the o-ring on the valve body.

22.jpg


As i wanted the hole dia for what i had in mind there was no turning back. So what i did was turn a semi thin steel shim to support the o-ring and we were good to go.
Now.
The P-15/35 and the M-16 in essence share innards.

As you´ve already found out the main culprit getting these to breathe is plenum volume.
At the time i had a M-16 i fooled around with, and i ended up fabbing a stand alone plenum on approx 140cc´s. Massive? You bet, but then on the other hand it sure delivered.

19.jpg


Being lazy i opted to use the reg pressure gauge hole for entry. Worked a million bux and in the end, even on that short a barrel, i was pushing an easy 125J and there was room to spare.
Idea was for a longer barrel, of course, but.. that kind of went nowhere for different reasons.

None the less.
The ticket to making these puffs stand tall is no doubt ample plenum volume. Them smaller bolt on ones simply don´t cut it if you really want to get things moving.
 
On souping these things up.
For the 25cal be aware that as you start getting into more serious porting on them for a 25cal you´ll sooner or later "break into water".
Ie; the transfer will end up running into the sealing "shelf" for the o-ring on the valve body.

22.jpg


As i wanted the hole dia for what i had in mind there was no turning back. So what i did was turn a semi thin steel shim to support the o-ring and we were good to go.
Now.
The P-15/35 and the M-16 in essence share innards.

As you´ve already found out the main culprit getting these to breathe is plenum volume.
At the time i had a M-16 i fooled around with, and i ended up fabbing a stand alone plenum on approx 140cc´s. Massive? You bet, but then on the other hand it sure delivered.

19.jpg


Being lazy i opted to use the reg pressure gauge hole for entry. Worked a million bux and in the end, even on that short a barrel, i was pushing an easy 125J and there was room to spare.
Idea was for a longer barrel, of course, but.. that kind of went nowhere for different reasons.

None the less.
The ticket to making these puffs stand tall is no doubt ample plenum volume. Them smaller bolt on ones simply don´t cut it if you really want to get things moving.
Did you want to know if I sorted. y poppet valve out? if so the answer is yes!

IMG_20250813_190314.jpg
 
On souping these things up.
For the 25cal be aware that as you start getting into more serious porting on them for a 25cal you´ll sooner or later "break into water".
Ie; the transfer will end up running into the sealing "shelf" for the o-ring on the valve body.

22.jpg


As i wanted the hole dia for what i had in mind there was no turning back. So what i did was turn a semi thin steel shim to support the o-ring and we were good to go.
Now.
The P-15/35 and the M-16 in essence share innards.

As you´ve already found out the main culprit getting these to breathe is plenum volume.
At the time i had a M-16 i fooled around with, and i ended up fabbing a stand alone plenum on approx 140cc´s. Massive? You bet, but then on the other hand it sure delivered.

19.jpg


Being lazy i opted to use the reg pressure gauge hole for entry. Worked a million bux and in the end, even on that short a barrel, i was pushing an easy 125J and there was room to spare.
Idea was for a longer barrel, of course, but.. that kind of went nowhere for different reasons.

None the less.
The ticket to making these puffs stand tall is no doubt ample plenum volume. Them smaller bolt on ones simply don´t cut it if you really want to get things moving.
hey now I've woken up a bit. lol, i done mine with the dremel buddy it's so simple, (and believe me if I can make them anyone can) 😂, all you need is sand paper 240 grit is what was used to sand the white plastic, then it was shaped for the valve to sit in, then it was cut (the steam) it was ment to be cut at 41.8 mm but it cut to 42.5, using a small disc cutter with the dremel then using the sand paper polish up the end you have just cut other wise it will have difficulty going into the valve as that happened to me, (thinking the worst) 😂 but all it needed was some sand paper to get rid of the fragments of metal from the end off. like I said buddy very easy😉 GOOD LUCK!!! 🤝