I´ll say this much, i´ll be happy to help out if i can.
So nope. You won´t be alone on this one.
Reg pressure can be raised, and that rather dramatic actually. Just.. it won´t stay on a given setting and this is due the folk at Aselkon deciding on that hard plastics isn´t needed for reg pressure seal.
ALL others, stock or aftermarket, do exactly this. Use at the bare min a hard plastic disc that the reg opening seals against.
Not Aselkon though. They knew better why the opening is sealed vs a soft rubber "puck" set into the housing.
Right.
A seal out of PEEK, or even brass, could be expected from say 140 bar up. Mans though need to safeguard, and below them 140 POM in my opinion no doubt is a very viable alternative.
POM will actually work rather well on higher pressures too, just not as long.
100 bar and you´re not even CLOSE to power potential on this piece. Let it be known though that the Aselkons that sport an internal reg to the tube MIGHT need an "extractor" in the form of a rod or similar on M13*1.
Living in metric country this is an odd thread even to me, but be so adviced. To be able to remove the reg in turn you´ll need a 1/4" drive with a 7 mill socket. This to remove the inlet orifice. As you do said M13 thread becomes evident.
It MIGHT move just using regular pliers, but don´t count on it. If you need to hand it all the onions, back off cause then a mandrel on M13*1 is simply needed.
For the sake of argument FX´s breech piece is on that thread, if you can´t find any other means. If not, might be able to score a M13*1 die on e-bay?
Anyways.
With the reg out the part that sits inwards is now to see and here´s the thing... The stack of belleville washers are there per regular but these are installed on a brass plunger and the last thing is that this entire enchillada is the bolted to the main reg housing via a larger "nut" (looks like).
Here the stock poppet with its brass bearing and seal next to the regulator, with the inlet orifice unbolted and said 7mm socket.
To increase reg pressure "there abouts" turn that LARGE brass nut like half a turn anti clockwise. This should hand you a step from say 100 bar to approx 150, which should suffice for extracting at least SOME power from that thing.
Install is just the reverse of how you took it apart. Reg pressure shows up right away as you fill it up, so if you feel the need for further adjustment just de-gas the gun and repeat.
In my opinion these units ain´t really let to shine until you ask them for some power. As far as that unmodified units (read - no external plenum added) seem to stonewall around the 65-75J mark for a 22. The former for the tube versions and the latter for the bottle guns.
Anymore than that and a plenum is needed.
HANDED a plenum on the other hand, coupled with porting and so forth, the really DO start to shine and as stated can be run rather on the jagged edge to no ills i´ve experienced so far.
Porting?
Yes.
As these are regulated guns just port to caliber size and be done with it. Ie; if a 22 make transfers 5.5mm and a 25 6,3mm (1/4") Point being that power can always be adjusted DOWN, it´s way harder to increase on a gun that isn´t let to breathe.
As you might have read up both of mine have been converted to run a poppet on a 2mm dia spindle. This is a very "free lunch" approach that carries basically no flipsides what so ever.
The use of PEEK plastic for a seal though i´d say is limited to guns expected to run 140 bar reg and up. If not, go POM.
In all fairness tho let´s also arrive on that these units were designed and built before the current wave of "plenums for all", which also tells massive amounts of intended power levels i guess.?
That being said.
"Tread gently, carry a big gun". Suspect anything in sight to be off spec, to the letter. EVERYTHING needs to be checked, Aselkons QC dept must have been in a locked cellar with no lights, let me put it that way.
But.
As i write above, regard it as a kit gun instead, if nothing else to keep your own sanity. Work steadily, go over piece by piece ´til happy.. one step at a time.
As i write first thing, i´ll be all to happy to assist as i can.