Kiwi Airgunners Forum : Umarex .22 calibre 850 M2 www.kiwiairgunners.co.nz/ This is an XML content feed of; Kiwi Airgunners Forum : Reviews : Umarex .22 calibre 850 M2 Copyright (c) 2006-2012 Web Wiz Forums - All Rights Reserved. Wed, 13 May 2026 20:02:23 +0000 Sun, 09 Feb 2025 09:30:31 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 10.14 360 www.kiwiairgunners.co.nz/RSS_post_feed.asp?TID=789 Kiwi Airgunners Forum www.kiwiairgunners.co.nz/forum_images/logo.jpg www.kiwiairgunners.co.nz/ Umarex .22 calibre 850 M2 : Accuracy follow up.I continued... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=12003#12003 Author: mercs
Subject: 789
Posted: 09 Feb 2025 at 9:30am

Accuracy follow up. 

I continued to have "fliers" despite numerous changes to the rifle, pellets and technique.

Not using the bipod mounted on fore-stock picatinny rail was last piece of puzzle to prevent “fliers”.
Any forward pressure from bipod transfers to the barrel.
I have checked the barrel fit and mechanism and there is nothing loose so I believe the barrel deflects.

I do not notice this with my almost identical Hammerli .177 which has a bipod retro fitted.
There will be a difference in barrel cross section and subsequent strength.
Hammerli Barrel OD 15.1mm ID 4.5mm
Umarex Barrel OD 14.9mm ID 5.5mm

The OD difference was unexpected.
Invites a future comparison strength test with some weights and dial gauges.
]]> Sun, 09 Feb 2025 09:30:31 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=12003#12003 Umarex .22 calibre 850 M2 : Summer conditions test of M2 CO2... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=12002#12002 Author: mercs
Subject: 789
Posted: 09 Feb 2025 at 9:12am

Summer conditions test of M2 CO2 usage with Walther 12 gramme cartridge adaptor ($200)
60 shots without any discernible change in performance.
I was surprised at the high shot count so immediately repeated the test with same result.
Warm afternoon at 23 degrees Celcius.

These were my preferred genuine Crosman capsules at $2.50 each. 
Prices range from $2 - $3 and bulk purchase can reduce costs.
 
Walther adapter with US 1 cent coin between the capsules ensures an effective pierce of both ends.


Adaptor is valved so can be pressurised and then safely inserted or removed from rifle.




Edited by mercs - 09 Feb 2025 at 9:43am]]> Sun, 09 Feb 2025 09:12:36 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=12002#12002 Umarex .22 calibre 850 M2 : As Billbobnz suggested needed... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9551#9551 Author: mercs
Subject: 789
Posted: 05 May 2024 at 1:39pm

As Billbobnz suggested needed a decent size suppressor like Andy-A's.
I am also using the JSB Exact 14.3 grain which I note were in Andy-A's pictures. 

With the suppressor and bipod brings mine in-ine with the Empire kit sold in the UK.


Newly arrived CO2 adaptor lets me use 2x12 gramme capsules when plinking at home.
Adaptor can be removed pressurised, so I can make the rifle completely safe without venting CO2.




Edited by mercs - 05 May 2024 at 2:31pm]]> Sun, 05 May 2024 13:39:26 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9551#9551 Umarex .22 calibre 850 M2 : A happy bunny, well perhaps not... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9265#9265 Author: Andy-A
Subject: 789
Posted: 11 Mar 2024 at 2:07pm

A happy bunny Smile, well perhaps not a bunny, they're in for it Big smile

FYI I flicked you a message, re coms I had with Umarex techs in Germany

Edited by Andy-A - 11 Mar 2024 at 2:10pm]]> Mon, 11 Mar 2024 14:07:56 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9265#9265 Umarex .22 calibre 850 M2 : This was rather pleasing.5mm spacer... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9264#9264 Author: mercs
Subject: 789
Posted: 11 Mar 2024 at 1:55pm

This was rather pleasing.
5mm spacer placed behind hammer spring.
11.5ft/lb
Definitely improves options for pest control.

25 yards, warm and calm evening.
Bench rest using shooting bag.
.22 JSB Wadcutters, Stealth reflex sight, 150mm target
Reticle dot and ring with horizontal and vertical lines which aligned perfectly with the target outside diameter.

5 shot Group OD <1"


]]> Mon, 11 Mar 2024 13:55:52 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9264#9264 Umarex .22 calibre 850 M2 : Good to know ... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9263#9263 Author: Andy-A
Subject: 789
Posted: 11 Mar 2024 at 10:51am

Good to know ...]]> Mon, 11 Mar 2024 10:51:06 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9263#9263 Umarex .22 calibre 850 M2 : i appreciate the advice and great... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9262#9262 Author: mercs
Subject: 789
Posted: 11 Mar 2024 at 10:32am

i appreciate the advice and great pics, same mod done apart from blue plastic pen was sacrificed for spacer. 

Rifle, assembled and back out this afternoon, shot some nice targets and plinking out at 26 yards definitely hitting harder well worth the time.

Nice one Andy.
]]> Mon, 11 Mar 2024 10:32:10 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9262#9262 Umarex .22 calibre 850 M2 : I don&#039;t know if you&#039;ve... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9261#9261 Author: Andy-A
Subject: 789
Posted: 11 Mar 2024 at 9:34am

I don't know if you've had it apart yet, but just passing on some info, from memory, don't pull the cocking leaver (I think) back too far, it has the smallest spring in the world, holding the smallest ball bearing in the world, which will launch itself into oblivion, given half the chance, I had to send off to UK for replacements and ended up using one of those food dome nets to capture it when refitting the bits :-)


]]> Mon, 11 Mar 2024 09:34:35 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9261#9261 Umarex .22 calibre 850 M2 : I owned one of these a few years... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9260#9260 Author: Andy-A
Subject: 789
Posted: 11 Mar 2024 at 9:00am

I owned one of these a few years back, nice rifle.
I like this guys YT vids, and and did the mod he suggested in the video, it did make a difference
https://www.youtube.com/watch?v=0_yoiYmnuQA
Sorry for the big pics, had a bit of a wrestling match to get them on..





]]> Mon, 11 Mar 2024 09:00:11 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9260#9260 Umarex .22 calibre 850 M2 : They always look like they need... www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9259#9259 Author: Billbobnz
Subject: 789
Posted: 11 Mar 2024 at 4:52am

They always look like they need an oversize suppressor on the front haha]]> Mon, 11 Mar 2024 04:52:20 +0000 www.kiwiairgunners.co.nz/forum_posts.asp?TID=789&PID=9259#9259