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Daystate has vintage parts list and info on some of the old daystates online in daystates website. I resealed mine and can’t remember who‘s seal kit I used. Think they are online on ebay

I have similar mark 2 with swan neck cocking handle attached with grub screw. I broke sear on my trigger and AoA was able to get new one from daystate. It seems modern huntsman’s still use same trigger. At least parts fit

Might add that tuned hw97 only around 500 pellets so far. But already much better than factory. I bought 54 from guy who had it tuned by John but moved and didn’t have much space to shoot it. i had hurt my shoulder and wasn’t shooting it much because of cocking force. But shoulder almost...

I had an early 54 in 177. T01 trigger. Was more accurate than hw97k when both were stock From factory. But 54 was heavy and loud. Sold it. Still wish I had it. bought 54 in .22 tuned by John in pa. Phenomenal shooter. Quieter too but heavy and heavy cocking. Had John tune hw97 and it is...

FYI, I love the old daystate all steel action models. Not light but really solid and reliable. One of the parts I needed I accidentally broke, and the other was a non factory part somebody had installed in the past. Trigger sear and barrel to reservoir brass bushing for orings.

Shane has helped me get a couple of daystate classics up and running. CR94 and huntman Mark II. I was able to get parts for these old guns and keep them running. He had to go back and forth with daystate in england to see if they still had parts and to get them. BTW, it seems like the...

If you have say 50% relative humidity at sea level and at 5000 ft, the mass percent of water vapor in the air is lower at 5000 ft

Air density decreases with altitude. Air cannot hold as much water vapor as altitude goes up. Humidity decreases the air density. Airplanes need longer runway for takeoff on hot and humid days.

Regulators have duct or line to a reference pressure. So they regulate say 100 psi above reference pressure. If referencing atmospheric pressure you will have less than 100 psi reservoir pressure at higher altitude

Gauge pressure is pressure above sea level pressure. absolute pressure is the pressure referenced to zero pressure which is a vacuum. So you’re tire pressure gauge reads zero when it isn’t attached to tire and say 30 psi when it is. If you have absolute gauge it would read about 15 psI when...

flow is probably choked, meaning shock wave sits in throat of restriction. Thread just reduce size of throat. See fanno flow and rayleigh flow https://en.wikipedia.org/wiki/Fanno_flow https://en.wikipedia.org/wiki/Rayleigh_flow

I've put in several ARH old school kits and was disappointed with results. Shot cycle was harsh. I bought whole kit with spring, seals, top hat, etc, including the recommended lubes and tar. These were around 12 FPE .177 kits. Did one in FWB 124 also. About the same. 

just release all gas in tank and start over. Be careful to keep discharge gas away from everything. I deal with aircraft oxygen systems and most GOX (gaseous oxygen systems) are rate for 1800 psi. Iron or ferrous compounds are not allowed in systems, nor oil, etc. Just vent in safe area and...

I've gotten them from both pilkguns and neal stepp at ISS. there is a place on ebay in germany that sells 2002 parts. They used to to have the the bumper.

I put in maccari old school kit in my hw97 including all the tar and lubes recommended. It still has a harsh shot cycle. I have an RWS-54 tuned by John Thomas and it is really smooth. I am sending my HW-97 to John to tune and probably getting what kit he recommends installed.

nitrogen is used in aircraft tire because of no moisture. They require it because FAA and other authorities don't what shop air in aircraft tires because of the moisture in shop air Once airborne, the moisture in the tire freezes and the tire will be out of balance on landing if still...

I've bought airgun on paypal with paying the 3.5% to seller. It came in had problems, seller said he would make it right, then he didn't. Got tired dealing with him and said I wanted money back and seller balked. On ebay, it isn't a problem. On paypal it is. It took me 3 months...

Dow Corning 111, o ring and seal lubricant. Think it is now dupont molykote 111 Krytox is used on oxygen systems but is expensive.

The other difference is the bore size is larger. I just bought koi for .177 and it has bore of 0.30 inch. I have alan Z moderator for .177 and bore on it is 0.20. It's quieter, but not that much. I have had problems with pellet clipping with small bore diameters. FYI. If you have 10m...