Good morning, let me introduce myself, I am Valter, a new enthusiast of compressed air rifles, I have a Stoeger XM1 Bullpup rifle and I have just purchased a modification for the Stoeger XM1 Bullpup Power Tune Regulator and XL Plenum By Huma-Air, I wanted some advice and instructions on assembly that I can't find and if any of you have already assembled it and found improvements in all directions. Thanks in advance for any replies.
Stoeger Stoeger xm1 bullpup power tune regulator and xl plenum by Huma-Air.
- Thread starter Valter
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Welcome! Not sure if any here has knowledge on it but your best bet would be to contact HUMA.
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Search online for power plenum install huma , for Artemis p15 and or Spa /Artemis p35 they share 95% of components, including the airtube and regulator, or disassembly of these guns... I have installed the same on 2 P15's regulator Regulator goes in airtube facing fill end so plenum is facing the end that screws into the main block...
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I agree P15 videos are useful, I've used them. I put a "power plenum" from South Africa on my P15 in 25 caliber. I did not find it difficult. Your plenum is different, I believe it is internal. I have never seen the Huma regulator or plenum but have has my P35s apart many times. Do you have a specific question?
First step will be to let all the compressed air out. There is a screw for that on the back end of the air tube on the side. It's a straight bladed screwdriver screw on my P35-25 and a hex screw on my P35-22 and P35-177. You will have to take the action out of the stock and unthread the air tube from the rest of the action. You will have to loosen the two clamps that hold the air tube to the barrel. When you unscrew the air tube the valve should be visible. The stock regulator is held in place by friction against the two O-rings on the outside of it. You might have to bump it from the other end to get it out. I think there was another piece I had to unscrew first. There should be a tube/wrench for the air gauge in the little bag of O-rings which came with the gun. You just unthread the big nut that the gauge is screwed into and the tube is open.
There is a video for the South African power plenum I installed. It might be helpful.
First step will be to let all the compressed air out. There is a screw for that on the back end of the air tube on the side. It's a straight bladed screwdriver screw on my P35-25 and a hex screw on my P35-22 and P35-177. You will have to take the action out of the stock and unthread the air tube from the rest of the action. You will have to loosen the two clamps that hold the air tube to the barrel. When you unscrew the air tube the valve should be visible. The stock regulator is held in place by friction against the two O-rings on the outside of it. You might have to bump it from the other end to get it out. I think there was another piece I had to unscrew first. There should be a tube/wrench for the air gauge in the little bag of O-rings which came with the gun. You just unthread the big nut that the gauge is screwed into and the tube is open.
There is a video for the South African power plenum I installed. It might be helpful.
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No need for all that. Out of the box as is, after cleaning and filling, it is PERFECT. And if you are "new", who told you to get that stuff.?
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It's a nice gun but the plenum of the stock gun is quite small. Like 10 or maybe 15ccs. For a 177 it is fine. For a 22 it isn't bad. But the additional plenum really helped my 25. I might put one on my 22. I think the South African one is the biggest and it is only about 35ccs. It does make the gun a little longer, however.
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