Umarex .22 calibre 850 M2

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   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.

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mercs Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Apr 2020 Location: Stratford Status: Offline Posts: 296	Post Options Post Reply Quote mercs Report Post Thanks(0) Quote Reply Topic: Umarex .22 calibre 850 M2 Posted: 09 Feb 2025 at 10:30am
	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.

mercs Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Apr 2020 Location: Stratford Status: Offline Posts: 296	Post Options Post Reply Quote mercs Report Post Thanks(0) Quote Reply Posted: 09 Feb 2025 at 10:12am
	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 10:43am

mercs Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Apr 2020 Location: Stratford Status: Offline Posts: 296	Post Options Post Reply Quote mercs Report Post Thanks(0) Quote Reply Posted: 05 May 2024 at 2:39pm
	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 3:31pm

Andy-A Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 19 Oct 2020 Location: Manakau Status: Offline Posts: 86	Post Options Post Reply Quote Andy-A Report Post Thanks(0) Quote Reply Posted: 11 Mar 2024 at 3:07pm
	A happy bunny , well perhaps not a bunny, they're in for it FYI I flicked you a message, re coms I had with Umarex techs in Germany Edited by Andy-A - 11 Mar 2024 at 3:10pm

mercs Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Apr 2020 Location: Stratford Status: Offline Posts: 296	Post Options Post Reply Quote mercs Report Post Thanks(0) Quote Reply Posted: 11 Mar 2024 at 2:55pm
	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"

Andy-A Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 19 Oct 2020 Location: Manakau Status: Offline Posts: 86	Post Options Post Reply Quote Andy-A Report Post Thanks(0) Quote Reply Posted: 11 Mar 2024 at 11:51am
	Good to know ...

mercs Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Apr 2020 Location: Stratford Status: Offline Posts: 296	Post Options Post Reply Quote mercs Report Post Thanks(0) Quote Reply Posted: 11 Mar 2024 at 11:32am
	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.

Andy-A Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 19 Oct 2020 Location: Manakau Status: Offline Posts: 86	Post Options Post Reply Quote Andy-A Report Post Thanks(0) Quote Reply Posted: 11 Mar 2024 at 10:34am
	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 :-)

Andy-A Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 19 Oct 2020 Location: Manakau Status: Offline Posts: 86	Post Options Post Reply Quote Andy-A Report Post Thanks(0) Quote Reply Posted: 11 Mar 2024 at 10:00am
	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..

Billbobnz Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 14 Jun 2020 Location: Ashburton Status: Offline Posts: 882	Post Options Post Reply Quote Billbobnz Report Post Thanks(0) Quote Reply Posted: 11 Mar 2024 at 5:52am
	They always look like they need an oversize suppressor on the front haha