My 850 - FINISHED

My 850 - FINISHED

Joined: March 28th, 2005, 5:23 am

October 29th, 2011, 5:11 pm #1

I purchased my 850 (.22)in July 2008. I immediately converted it to bulk CO2. Unfortunately the smallest group it would shoot at 15 yards was 12 inches. Roald determined it had a bad barrel. Many of the early .22 cal. 850's had bad barrels. He was able to get the barrel replaced and tuned the gun. Roalds tune brought the gun form 624.6 fps to 704.2 with a SD of 1.3. The final conversion was the addition of a JDS airman 13 cu. in. 3000psi input with 1400psi Regulated Output. The velocity with RWS Superdomes is now 829 fps. It is capable of shooting the same hole at 45 yards. The scope is a Bushnell Banner 6-18X50 AO. As you will see in the pictures I added a target turret, scope level, bipod and moded moderator. The ugly area between the tank and the stock was wrapped with foam pipe insulation then covered with heat shrink tubing.









Plano John
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Joined: May 12th, 2010, 4:36 pm

October 30th, 2011, 10:14 am #2

great looking gun , btw what's the shot count per fill before it falls the regulator? How to do manage to align the guage and fill adapter with as to pb adapter?
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Joined: March 28th, 2005, 5:23 am

October 30th, 2011, 1:53 pm #3

I haven't done a shot count. There was no problem aligning the tank. I did have to remove the fill nipple and gauge to install the tank. It turned out that the barrel was centered between the fill nipple and the gauge.

Plano John
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