|Max Velocity||760 fps|
|Front Sight||Fiber Optic|
|Rear Sight||Fiber Optic|
|Suggested for||Plinking & target practice|
|Trigger Pull||3.0 lbs|
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Things I liked: accurate, plenty of power for metal targets pt 20 yards.
Things I would have changed: an adapter for 12 0z co2 would be nice. the 88 oz are great but it is hard to shoot enough to put gun up empty. 88 oz is good for over 200 rounds.
Things I liked: I am a hunter. Clearly, this is a repeater results in a more much productive hunt. Once I dialed in my scope to my choice of ammo, the gun is a beast!
Things I would have changed: My complaint is: I went to Amazon and purchased a bulk quantity of CO2 cylinders (JT brand). I screwed in the cylinder and it held for a second or two then blew out the o-ring (I lost the o-ring in the field). Nobody in America had the o-ring and I could not find anyone who could give me the specs on the replacement...it's a frickin' o-ring...I should be able to find it anywhere. I order three overpriced o-rings from the UK and installed one in my 850. Same thing happened. Tried a different o-ring: same thing. Umarex says don't use Air Venturi cylinders. I didn't. I used JT cylinders. Upon viewing the available cylinders available on-line it became apparent that there seems to be no quality control in your air cylinders. Here is a comm. I sent to JT, Umarex and Pyramid: "Johnny, Here is a photo of the two different versions of your product I found on line. The first one clearly has a shorter nipple where the cylinder marries with the o-ring. The second has a longer nipple (this is the version I have and is not compatible with my Umarex Hammerli AirMagnum 850). The first one clearly has 15-16 threads and the second has maybe 10-12 threads. They ARE different, but packaged as the same. This is becoming very frustrating...What is the deal?
What others should know: Awesome pellet gun! However, the gun seems to be finicky when it comes to the co2 cylinders you select. Apparently, either sellers are not aware of this or they don't want you to know there is an issue.
Things I liked: + Bolt action 8-shot repeater! + Bolt action 8-shot repeater! + Bolt action 8-shot repeater! + Comes with 2 magazines (I honestly see no reason to get more) + Lightweight & Durable synthetic stock + Requires no special holds or techniques to shoot + 11mm dovetail optics rail (I recommend UTG/Leapers scopes), you can also completely remove the front and rear sight assemblies. + Extremely easy to maintain and service, I recommend a silicone-impregnated gun sock @ Walmart for $15 for storage, especially long-term. + Adjustable lightweight trigger + Dead accurate; from benchrest I shot less than half-inch groups @ 25 yards (.177cal).
Things I would have changed: - ASA (brass thing you screw the tank in to) o-ring has a tendency to go bad after about 300 shots causing the CO2 to leak out. Just take out the o-ring and drive to your local hardware store, problem solved, 10mins & $0.50 per o-ring (buy a couple). Re-oil it at least once every 500 shots (if it lasts that long). - The obvious downside is that it runs only CO2, which practically limits the gun to summer-time shooting only. For most shooters, this is not a problem, but for winter-time hunters this is a major drawback compared to PCPs; 850 will suffer performance loss as the CO2 cools. I have not tried winter-time shooting, but I only shoot paper targets and cans. - The gun does not come with any degassing device or mechanism built into it. Once attached, unscrewing a CO2 bottle will cost you the entire rest of the bottle. You can however purchase a device for 88g's that you screw on top and acts as an on/off seal to preserve bottles.
What others should know: Recently started shooting my .177 850 again, had the thing since 2011 but put less than 1000 rounds through it. Six years later I take it out, replace the ASA o-ring, and I've had no problems with it at all. Decided, since its well out of warranty at 6 years old, to take it apart completely and clean & regrease/oil it. Internals are not crazy-complex but there are a few small parts (depends how in-depth you go really, ie dont take apart the bolt assembly theres no need). YouTube 850 air magnum disassembly. Barrel has a tendency to rust but this is completely normal for blued steel (very common on firearms and pellet rifles), like I said above just a little bit of RemOil and a paper towel/tarry cloth will do the trick, steel wool if its really bad. Buy CO2 tanks at Walmart, and o-rings for the ASA at your local hardware store or Home Depot/Lowes. Do not store it with a CO2 tank attached for more than a day or two. That's how you damage components, specifically o-rings.
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I asked the question below and it was suggested I call Umerex. I did and they said the Air Venturi bottles are not compatible. Sure enough, all 88/90 gram CO2 cylinders are not created equal. Some have a longer nipple (Air Venturi)than others. The longer nipple prevents proper seating against the O-ring. Has anyone else experienced this? Q. - The o-ring in my 850 failed to hold pressure so I ordered three new ones from Umerex. While screwing in a cylinder the new o-ring blows a second or two after the cylinder in punctured. I tried several times with another new o-ring with the same result. wtf?
I have seen it before with the Sig MPX/MCX, some guns seem less prone to have issues with the varied 88/90 gram cylinders than others.
The o-ring in my 850 failed to hold pressure so I ordered three new ones from Umerex. While screwing in a cylinder the new o-ring blows a second or two after the cylinder in punctured. I tried several times with another new o-ring with the same result. wtf?
I would contact Umarex about that. Does the o-ring hold pressure for a few seconds and then blow out? Or does it start leaking immediately when the cylinder is pierced?
Can you use an 1100 psi regulated high pressure air tank instead of the Airsource Co2 tank? I imagine you'd need an airsource to paintball thread adapter-are they available?
Folks have modified the stocks to accept the 13 cu in tanks, so it can be done. But at that point, you're getting to a point where you're putting a good amount of money into a gun that you could get the same features out of as the Umarex Gauntlet.
|Max Velocity||760 fps|
Only 3 left in stock