Custom PEEK Washer for Impact M3

[kayakman]

I also have one of his parts in my Impact and my first shot on average is 9 fps faster on first shot 2nd and all following are rock steady at its tuned velocity cant imagine why some aftermarket company hasn't started producing them....

 

[Airgunnerscott]

I can make one for you, but the modification mubhaur did looks to be a better solution.

Thats good to know Thank you, if for some reason I cant get that part from mubhaur I'll be getting back to you...

 

[Airgunnerscott]

I have his part in my Impact. If its tuned properly the first slow shot is gone(my first shot afther storing for days is 15 fps lower) . If you tune it to 98% of the plateau its spot on from first shot. I tuned mine to 95% to save some air. I cannot hunt in my country so 15 fps doesnt do much

yeah that wouldnt be so bad, right now my impact takes 5 to 7 shots to get it all back on track. after sitting overnight.

 

[Ries]

yeah that wouldnt be so bad, right now my impact takes 5 to 7 shots to get it all back on track. after sitting overnight.

Yeah I get you. I was about to sell my impact because of that.

Atleast @mubhaur makes a quality part for it.

 

[Airgunmann]

much better fix,
Airgunmann Have you tryed one of these from mubhaur yet?

No but I have tried other parts from him and they are really good quality and held to tight tolerance I wouldn't be afraid to get anything from mubhaur ever again great to deal with to

 

[jfgdds]

I’ll order up some PEEK and make some. I didn’t have any plastic that size on hand, so I made a test piece out of aluminum and scaled the width from the drawing posted above, I’m away for the day but I think it was 2.5mm. I used a reamer I have for the bore and it measured 2.98-2.99mm, so if that works for the bore, that will help keep the costs down if I don’t need to use a boring bar.

I built 5 or so back when we all were involved in that topic. I just used a 3mm drill bit and they slid very nicely over the valve rod. The most important thing is the final fit. If you don’t get the angle exact, it changes the seating depth. It’s not the end of the world if you don’t get the angle right because during the final fitting you make sure you can’t see any part of the oring in the plenum refresh hole. I used a Viton but still used the other little black oring too. If you see oring through the hole, you have to surface the disc and make it thinner until things are right. Also during final fitting is make sure the valve rod moves freely and centered once everything is packed in there.

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 in the otherwise flat surface. The purpose was to provide support for the oring while under compression in order to prevent extrusion.

I also fabricated a 1 mm walled delron tube to secure in place the peek washer and two orings as I never liked how FX just secured them with grease. The delron tube is retained with a c clip.

I have a couple hundred shots through the gun now and slow first shots seem to be eliminated. Also, the valve system seems to operate more freely and easily now. Possibly the support from the radius I incorporated in the peek washer eliminated unnecessary drag on the valve rod allowing it to cycle with less force from the hammer. All fabrication was performed on a South Bend Heavy 10 lathe.

 

[Airgunmann]

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.

View attachment 545249

I fabricated the peek washer described in this thread with one modification. I incorporated a portion of the radius of the oring in the otherwise flat surface. The purpose was to provide support for the oring while under compression in order to prevent extrusion.

View attachment 545253

I also fabricated a 1 mm walled delron tube to secure in place the peek washer and two orings as I never liked how FX just secured them with grease. The delron tube is retained with a c clip.

View attachment 545251

I have a couple hundred shots through the gun now and slow first shots seem to be eliminated. Also, the valve system seems to operate more freely and easily now. Possibly the support from the radius I incorporated in the peek washer eliminated unnecessary drag on the valve rod allowing it to cycle with less force from the hammer. All fabrication was performed on a South Bend Heavy 10 lathe.

I like the it