Hatchet Posted July 22, 2014 Share Posted July 22, 2014 Our club recently started having Steel Challenge, so I decided to build an open rimfire pistol. For the optic I went with the standard C-more polymer sight. Today I spent some time sighting it in and shooting it. After getting it sighted dead center, I tightened the set screws and I noticed it was then shooting down and to the left about an inch at 15 yards. This was controlled from a bench so I'm not pulling it. Loosened the screws, dead on. Tightened the screws, off again. So I adjusted for this and have it centered again. Have any of you experienced this? Link to comment Share on other sites More sharing options...
OPENB Posted July 22, 2014 Share Posted July 22, 2014 Welcome to the Cmore! Fun, ain't it? Seriously, don't tighten the lock screws so tightly. And then check zero often, preferably before a match. Link to comment Share on other sites More sharing options...
mcbutler Posted July 22, 2014 Share Posted July 22, 2014 Hatchet, Go to re-gun.com . There is a great article on the proper way to zero a c-more. Link to comment Share on other sites More sharing options...
Shotz Posted July 22, 2014 Share Posted July 22, 2014 That is a great article! I never new that...I guess I have been lucky! Link to comment Share on other sites More sharing options...
Hatchet Posted July 23, 2014 Author Share Posted July 23, 2014 Hatchet, Go to re-gun.com . There is a great article on the proper way to zero a c-more. That is a great article. Thanks! Link to comment Share on other sites More sharing options...
Parallax3D Posted July 23, 2014 Share Posted July 23, 2014 Sometimes the C-More sights just get to a point where they won't hold a zero any more. (Although that tends to happen with Open guns running major PF, not a .22LR.)If it's still under warranty, C-More will fix it for free. If it's out of warranty, I think it's about $55 to have it fixed. Link to comment Share on other sites More sharing options...
rtl Posted July 23, 2014 Share Posted July 23, 2014 Hatchet, Go to re-gun.com . There is a great article on the proper way to zero a c-more. That is a great article - THANKS ! Link to comment Share on other sites More sharing options...
Shotz Posted July 24, 2014 Share Posted July 24, 2014 I have been using a C-More on my rimfire Open gun and have not had the drifing issue but I suspect this is because it is a .22. I plan on building a Glock Open gun this year and was going to use a C-More as well because that is primarly what I see at the games and I really like the one I have. Is this drifing problem really common? If so, why do most of the top shooters continue to use the product? Is there a better alternative? Link to comment Share on other sites More sharing options...
BoyGlock Posted July 24, 2014 Share Posted July 24, 2014 In my experience w/ glock and 2011, its not common. And for me theres no better alternative yet. Link to comment Share on other sites More sharing options...
Parallax3D Posted July 24, 2014 Share Posted July 24, 2014 Is this drifing problem really common? Not common, but it's known to happen. I have one that needs to go back for repairs right now. I bought the gun used, and have shot it for 3 years, and I'm not sure how long the previous owner had it. Figure 4-5 years of 9mm Major ammo, and it's not surprising that it might eventually have a problem. Nothing lasts forever. Link to comment Share on other sites More sharing options...
Flatland Shooter Posted July 25, 2014 Share Posted July 25, 2014 I have several C-mores that need to go back for repairs but in my case I think the problem was self-inflicted. You tighten the screws that lock the windage too much and you end up with problems. Before I screwed them up, no problem at all holding zero. Got them mounted on Open pistols, an AR and a MKA 1919 shotgun. Still the best mouse trap for my needs. Bill Link to comment Share on other sites More sharing options...
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