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I had the same problem with a brand new impact .25 power plenum. It was frustrating but an easy repair. You should be good now. Bert b

Opened up the barrel port. Probe looked good so just opened a small amount. 10 shot average up 25 fps. 955 now with jsb heavy. Reg still 150. Will try accuracy from here and adjust the valve stop to fine tune with the slugs in the slug liner.

34 jsb at 930 with the same settings. I am going to open up the port and pellet probe and compare the velocity advantage. Until tomorrow. B

Thanks for checking. Reg at 150. Hammer spring maxed out.. N 36.2 average 882. Valve stop at about 3.5 lines. Was close to 20 FPS higher with the valve stop at factory at 4 lines or right about 900 FPS. N 33.5 at same reg etc and 3.5 lines 930 FPS.

Thanks for the info. I just got my .25 MK2 700 MM with power plenum. I have no been able to get the velocities being achieved here. Have you done transfer port work and probe work. I did that on my crown but didn't think I would have to on my new impact. I am looking forward to a relatively...

Welcome aboard!. Do you ship to Canada? I have been trying to purchase a kit.

Long_Shot Thank you for this. It is very interesting. How do you make the slugs fragment. I have always been concerned about the energy left after pass through. Much appreciated, Bertb

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That sounds like a good idea. Thanks

I load a pellet then remove the mag. I then put my finger over the end of the valve stem. My finger is pushed back by the blow by. Bert

​My impact .25 cal is leaking, on firing, from the end of the valve stem. I have replaced the 1 x 2 O ring twice but it has not helped. In Ernest's video he talked about getting a next size larger O ring. Does anyone know where a slightly larger O ring could be found? My velocity will not...