Nice work
@GibsonVair !
It's very satisfying working and getting good results, isn't it?
I wonder.
Would you mind recapping your work and sharing the details here in the thread?
I for one would really appreciate it
just my too sents
Edward
I installed valve retaining screws from Magnum Air Power and his aluminum trigger group. An extra screw was placed in the radiused area on the front of the trigger guard to limit the sear engagement. This gives the effect of a two stage trigger and eliminates trigger creep. The over travel, 4-40 long set screw, was moved to this position. The hammer and hammer face were polished for smooth operation.
A standard valve was bored and radiused on the exhaust port to an .177" diameter. The inlet of the valve was machined to a 45 degree angle and the small and large diameters were radiused for air flow. The poppet stem, near the valve, was turned down to 1/8", again for air flow. A .177" transfer port was installed and the barrel port is opened up to the same diameter.
A plenum was installed to replace the restrictive gauge block. The rifle has no gauge. I was inspired by my Crosman 3622. (another story) Ahead of the plenum is a Huma-air regulator set at 130 bar. The pressure tube is filled to 3,000 psi.
An extra barrel band was added. I don't really know what effect that has. Buck-Rail supplied the silencer adaptor and silencer. I went with the modular model because of the tough material it is made from, and it can be cleaned internally. It is also the lightest suppressor I own. The adaptor is made for the Crosman 3622, but works perfectly with the Discovery.
The valve, barrel band, power adjuster and new cap came from Archer Airguns. At the rear, a hammer spring adjuster from a Crosman Challenger was used to fine tune. I tried several pellets and hammer spring adjustments. I still haven't chrono graphed the 16.01 JTS pellets in a shot string, but they didn't suffer from a continuing drop in point of impact through the shot string like every other pellet/tune combination previously tested, and I did check the speed at about 890 fps. The tested shot strings, when chronographed, didn't show a speed change, so I don't know what was going on with the drop in point of impact in accuracy tests. I know I get 20 good shots now, out to 50 yards.
I rubbed Min Wax paste on the stock and I think It looks really good now. The rubber butt pad was a grind to fit from Kick Eez, and the screw spacing was exactly like the stock plastic piece. I like the but pad so I can lean the rifle against things and it won't slip out and fall.
I do not like hand pumping. It seems to use about 60 psi per shot at 28 ft/lbs.
