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Hey there, I came across this thread as i was having issues with the first 5-7 shots on my M3 being slow. Evaluation of the polyurithane oring showed extrusion. I fabricated the peek washer described in this thread with one modification. I incorporated a portion of the radius of the oring...

If you look carefully the back of the bag says the oring store and the oring is part number U90104. Their white polyurithane oring may be superior to the white polyurithane oring fx uses.

Ok. NBR is just the standard buna oring used throughout the impact, in a dura 70 hardness of course. Glad it worked well.

Just checked a site. Viton dura 90 orings are available in black so the oring in question could be a viton as that's what the new M4 is supposably coming with.

Why did you choose a durometer of 75 vs 90? That's what appears on the print on the back side of the bag on the left. The new M4 is using a FKM (viton) oring in dura 90. Also, it is possible the viton comes in black. Im interested in the peek upgrade as well. I have a lathe so i will be making...

Hello, The above is a mod I did to my M3 valve stop. The delrin insert separates the valve spring from the valve stop which is also machined in delrin. This also allows the spring to function with much less play and friction. I also included pics of my custom barrel tensioning system which...

Frank320 I found your posts very helpful. I installed the 720 power plenum on my .25 cal impact x with 600 mm superior heavy liner and carbon sleeve. It has a huma dual transfer port. I also thought there was an issue with the power plenum spring. Per your suggestion I installed all the slug kit...