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Thanks cfs916 for the info. Last time I used blue Loctite, the installers (FX USA) used copious amounts of red, and it was very difficult to get off. I learned all about heat and Loctite and Chlorinated brake fluid. I trust blue when all the way screwed on. I have not buttoned it up yet, so...

I have a MK 2 with the new power plenum. And I was having trouble not getting enough hammer spring force to overcome the pressure in regulator... to push a 25 cal slug efficiently (I figure around 965 fps will do... I'm at 950 when I start losing power if I up the regulator with Maximum hammer...

A little late, but awesome job sir.

I've learned thru experimentation that slugs like a speed in the hood of 935 FPS (at least in my .25 cal). I've also learned there is a give and take relationship... if you go too slow on a slug, the groups suck, my guess is you are not getting sufficient spin. And if you try to get to fast...

Sorry Teufelhund84... I somehow missed your e-mail. Sure I will share. Barrel 700MM Wheel always on MAX Regulator is at 160 BAR HS is at 0.60 VS is at .355 on the flange (There is a small flange in front of the FX body, it is more accurate to measure from there) Average FPS = 928 FPS...

Heavy Impact... My guess is this is what you had in mind. The cost is reasonable given I really don't have a lathe, and by hand I don't think I could do as well. So I just ordered it . About $40 + shipping/taxes. I found on Ebay By next week, the squirrels had better be focused 💀. Thanks...

Heavy Impact.... OK.. now I see the bigger picture. Duhh. Once you see it makes sense. You are replacing the spring guide with a brass spring guide, and because it has a flanged head it gets propelled too. As far as the port... I don't think I'm brave enough to start drilling into existing...

Jaird, - I'm in Hampton Virginia. I do plan on being out at Halifax next week for bow hunting (i.e. headed SW). I was hoping to have the FX tuned in and ready for squirrels, but right now (today, moments ago) I finished up tuning for a bit, I'm not sure it is ready. Currently I'm at 152...

Thanks Airgun Hobbyst & Heavy Impact; ... I live in an area where I'm the only one I know of that has any air rifle (springer or PCP) so info is limited. So what I'm getting is that I need to machine a small additional hammer weight (around 4 gr give or take). I actually asked a similar...

Cool, do you have any info on that... ?

Whoops, there was a typo... not 4000 FPS, 400 FPS. Dang.

I have a theory, and I base this on evidence of my FX Impact MK2 .25, Cal 700 mm, using NSA 36.2 gr. slugs. When I got the MK in July I tuned it in for the Jumbo MK II JSB pellets, and it didn't take long before I was shooting with great accuracy... right around 915 FPS. Then came the slug...