Hammerli 850 (.177) HPA test results

[Silo]

I got the .177 850converted to HPA a little while back

The Scuba tank arrived this week, I got a 80cf 3300psi tank, $5.00 to fill.

and got a carry strap. boot and valve cover with it.... note, it's a boy tank

I had to Mill two small 3mm deep groves in valve facing side of the yoke to get it to fit correctly, the K valve on the tank has bigger than normal shoulders and wider on one side.



After this is it fit perfectly:

The gun was a breeze to fill from here:

Took it out back and put a few shots over the chrony:
It got a high of 871fps and a low of 848fps (quite a spread) then it seemed to settle down
to around 860fps.(855 to 865 over 20 shots)
I was hoping it would be a bit closer to 900fps. I think I'll take off the tank and test the output pressure
before I do any more to it.
If possible I'll try to get it to 1300psi. That should get it to justa hair under 900fps.... right where I like it.

Roald.

[Gene_SC]

Way to go Roald, that is a sweet setup.. I will be looking to duplicate it on mine..:) I have ordered a new stock from Umarex and should get it in a few days. I would appreciate it if I can get all the part numbers of the stuff you have here in the picture and where you purchased everything. I am on a roll..:)

Thanks for sharing with us buddy.

Gene

[Silo]

Thanks Gene.... Fiance hey? sounds like more fun than airguns ;-)

Here what I used:

I got my 22ci tank/reg and fill station / yoke from Mat Bean:

88$ each for 22 cu in complete with 1200 psi output tank. (the 13cui is a bit cheaper)
50$ for used scuba yoke.
$11.57 for insured signature confirmation parcel post shipping.
149.57$ total

You’ll also need one of these from Bryan $ Associates… or just make one ;-)
Note it's the very short brass one, not the black one.

Paintball to 88 gram Air Source $25.95
Attach any paintball tank even the pin valve tank to the Air Source male