Yeah. So to bring everybody up to speed.
Yes that´s an external plenum and yes that´s the Reximex NYX in case. In other words the mods pulled can just as well be performed on a Benjamin Gunnar too.
More to it than meets the eye though. The thing now sports a PEEK seal on a 2mm dia shank for the poppet. Runs ported to caliber which brings that the hole for the power adjuster has been reamed out to 10mm flat and fresh barrels have been made for it.
The plenum enters via a hole cut right at the edge of the cavity upstreams of the actual valve, threaded 1/2"-28 UNF. Seals via the use of a so called stat-o-seal washer, and it works wonders TBH. Thing just keeps pressure like was it going out of style.
Due the porting we see rather decent power already at lower reg settings, like 110-120 bar suffice just fine for anything pest within 100 yards.
The stock diffusor as mentioned was told to leave the chat and a fresh one was made out of steel. Shroud could then be shortened a fair bit (approx 100mm) which of course was of good use. Can in turn is one of my home brew ones, for use on airguns only as it uses fibre material within.
It seals up as well as we can ask and thus is very very low key in use.
Tube is on a full 10mm diameter. Mentioned stat-o-seal washer can be clearly seen in the pic.
The thing shoots both hard and well. No issues what so ever making one hole groups at 30-35m so all in all rather happy with the outcome.
Only real flipside i´ve experienced thus far is that the cocking pin on the hammer didn´t take nicely to the spring forces at hand why it bent. No wonder seeing how short it was, made a new one out of high grade steel and done deal.
That aside the thing just mainly.. works.