Simply using a leather strop with some green diamond embedded works wonders on the brass and the Deron, then finish on a plain strop
Yup! Haven’t polished the delrin yet!
That's why you do it by hand. It's the Delrin that wears a hole, depression BUT...honeslty I'm not sure it matters, just seals better. The brass won't wear, the Ti IMHO is a gimmick and a certified beech to machine.
Sorry, I’m confused. I was aware the delrin deforms some but are you saying the brass adjustment screw is not the problem and causes the creep? Cuz I’ve been polishing the screw not the delrin. I’ll polish the delrin as soon as I hear back from you.
You have to do both, both need a slight dome. I helped a guy with his M3, the delrin was concave, luckily I had some spares laying around, hey it's FX you need spare parts. I sharpen things, kitchen knives, scissors, Katanas....I thought I try the little reg part on my 12" strop, worked like a champ, the untreated side put a heck of a finish on it. In a previous life I made things smooth/flat/shiny or round and shiny. A simple figure eight, rotate it every so often. Today's pro tip, put the adjuster in upside down in the top of the body that holds it, makes it easier to hold. The brass pistons with the delrin are cool BUT I got a few where the delrin was out a bit too far, about 1mm or so too much needs to be .5mm or slightly less above the brass, I'd say .2mm or .010".
Got one……30/60, just never looked at the Delrin on the piston before. Dumb me!!!
www.airgunnation.com 
PEEK has been used for many years to make valve poppets in AGs, chiefly because it has very high compressive strength and therefore makes valves easier to knock open (with less hammer). It’s readily available on eBay if you want a stick. Since it has the same hardness as brass, it will need a harder material to mate with in the reg. I like to use it in the striking face of my hammers to remove the ping on impact. Just added a stub of it to this one:
How did it do Bhaur. I’d imagine there are pros and cons!Tuning - FX Impact brass piston with peek seat
As FX moved to brass piston bodies for regulator, I also made a couple but with peek seat. Umair Bhaur
In above post you can see that peek tip pistons are being made from more than last two years.
Yes there are a bit of cones for AMP regulator. It becomes difficult to make such piston with really square surface to avoid creep.
If you ask questions here you find the tidbits, you also have to not be afraid to screw something up, hopefully not beyond repair. I've learned a lot from the more experienced people here and I'm also not afraid to try something, worse case, spend money to fix it. I'm one of the 'new kids' here, only really been into airguns for 3 years and only because I was forced into it. Splatting ground squirrels with a PB and a dog on the property didn't like it so had to get into airguns and down the rabbit hole I go.
My journey is similar, about 3 years with my Maverick. Tried to do it with cheap, then really good break barrels but found these to be quite tough to shoot accurately. Hold, pellet choice, many variables. Enter the PCP era! Cheaper first (Avenger) then FX.
Well I started off with a break barrel, cheap, turned out the barrel was bent so I straightened it, have it shooting fairly well but not at the distance I needed, 50 to 125 yards, so, a Sapsan, that was better but had some issues, then a Maverick VP, the usual FX quality control issues, fixed it, then a pre destroyed Maverick that I turned into a .22 compact, let's call it a learning experience. I finally have my Mavericks working fine, my Sapsan is as good as it's going to get. Have a Raptor works well except for a darn leak I can't find, not fast so when shooting it, so it doesn't matter. Also have a Tequila Pistol, another learning curve, mostly my fault of being brain dead, it's pretty darn accurate at 25 yards, more accurate than I am. Oh and an OLD Daisy 717 that just shoots, need to fix the sights on it. Did a trigger job on it a long time ago, a sweet shooter.
