CO2 powered Umarex 850 Airmagnum
- 32 Comments
- Last updated: 30/01/2017
I've been a great fan of CO2 pistols since they came off the ‘prohibited’ list– in fact they should never have been on it in the first place. At that time ‘real’ handguns had just been banned (in 1997), and while CO2 replicas would never replace real ones with pistol shooters, they certainly did draw a whole new group of people into shooting sports, and in doing so saved some gunshops from the worst financial effects of the post Dunblane legislation. Some of the best CO2 pistols come from Umarex, and there’s no doubt that they have proved extremely popular. They were realistic looking, fairly accurate and offered a quick fire medium for competition handgun shooters within the new firearms legislation. I even bought a S&W replica revolver myself, even though I never got into the competition side of CO2 pistol shooting.
Although CO2 pistols certainly took off, gas powered rifles weren’t as successful. This was mainly because of two factors; CO2 rifles generally lacked the power for hunting or pest control (most gave significantly less than 12ft/lbs of muzzle energy) and they ran through standard 12g CO2 gas capsules at a rate of knots. This latter factor meant that you had to ‘power them up’ with gas capsules at a fairly frequent intervals, and of course you had to pay for the capsules – around £6.50 or so for a 10 pack.
For these reasons I never really got all that interested in many CO2 rifles – apart from a few…
.22 on Test - .177 Available
Pop out Auto or manual safety button with disengaging slide (hold slide down and push button forward) red dot shows when ready to fire
Undo cover – press bottom of forend in and pull forward to remove front cover exposing inlet valve. Screw in 88g CO2 capsule or double 12g adapter. Dry fire to make sure that capsule in fully engaged and pierced. Dry fire to make sure. Never remove a full 88g capsule as the high pressure gas could damage the seals.
8 shot mag pellets held in by O ring on the right hand side plus bolt has to be lifted up out of retaining slot and withdrawn. Pellets up to 10mm in length can be accommodated in the magazine.
Trigger Adjustable For Travel.
Pellet jammed in barrel through drop in CO2 pressure – replace capsule but not magazine, then shoot pellet out. If not, lay the rifle horizontally and clear jammed pellet with a cleaning rod.
Low on gas?
Discharge crack is muted
Pellet sticks in barrel – extreme case
Sliding wedge sight adjustment for elevation; high – move back low – move forward
Front sight for windage. Two green rear and red front hi viz??? fibre optic
92 oz weight
654fps – 16 joules
Moderator available (ref. 465.101)
Picatinny style scope rail
Umarex CP88 with Walther Multi Dot Sight MDS
Frame release gices access to magazine
Grip plate release button
Cartridge lock at bottom of grip
Flat heads recommended but domeheads working, providing they are not longer than pellet chamber.
Double or Single Action
8 x 3 mags
7” (180mm) long without mod 11.75” with mod (300mm)
2lbs 11.75oz (1.238g)
Rifled Barrel 4” (100mm) or 8 5/8” (220mm)
Trigger safety when slide open
Detachable moderator 90g or 3.25oz
Electronic red dot sight mounted piccatinny rail – red aiming dot projected onto front lens – as you don’t have to line up front And Rear, you can just point and shoot keeping both eyes open. Ready mounted = locking screws on base. 7.5cm (3”) eye relief. On/off switch, battery housing combined with rheostat 1 to 7 – lines up with left side. MOA lever (dot size adjuster) – four sizes available.
3v lithium battery CR2032 – when red dot gets darker or disappears
Elevation and windage – release locking screw (on the base below windage adj.screw) with Allen key supplied, and adjust Elevation and windage screws to suit. Each click moves the point of impact 1/3 MOA – 0.97mm at 10m or 9.7mm at 100m. Retighten locking screw.