Help zeroing red dot

[lafn96]

Had a stuck choke tube that I tried everything on and couldn't remove, ordered an 18" barrel for my mossberg 500 and put in a Carlson turkey choke. The new barrel isnt ribbed, so I couldn't switch over the sights. Ordered a rail and a vortex viper red dot, sighted in yesterday and it's hitting about 12" high at 20 yds with the red dot maxed out. A little higher at 40 yds.

If I put a shim under the rear of the rail with the red dot mounted at the front of the rail, should that work?

 

[megalomaniac]

yup

had to put a shim under the rail on my turkey gun when I installed it.

 

[lafn96]

yup

had to put a shim under the rail on my turkey gun when I installed it.

Thank you, what'd you use for a shim? Feeler gauge?

 

[megalomaniac]

just a strip of copper so it would form to the receiver and underside of the rail when i screwed the rail down.

 

[knightrider]

Vortex are horrible for getting stuck, run it all the way up than down , back up and half way back down and start over, it sounds dumb but most times it frees it up to let you move it on down

 

[REN]

Just aim at his feet

 

[Southern Sportsman]

Something definitely doesn't sound right about that. What kind of rail and mount are you using?

One good thing about Vortex, their warranty and customer service are exceptional. I would call them and explain the problem. They may have a suggestion or may swap the sight in case that's the issue.

 

[Remi]

Vortex are horrible for getting stuck, run it all the way up than down , back up and half way back down and start over, it sounds dumb but most times it frees it up to let you move it on down

A friend has had 3 and they've all stuck. He called Vortex and they gave him the same instructions and it freed them up.

 

[tntrkkllr]

I've never used vortex they aren't as well known for reliability like a Burris, but I would contact vortex for help or switch to a BurrisFF3 to get rid of all issues and still have a life time warranty

 

[lafn96]

Something definitely doesn't sound right about that. What kind of rail and mount are you using?

One good thing about Vortex, their warranty and customer service are exceptional. I would call them and explain the problem. They may have a suggestion or may swap the sight in case that's the issue.

The rail is a UTG, and the mount is the one the red dot came with. Called vortex and they're sending me a shim, but I'll have to make a temporary one to sight in hunt this wknd.

 

[axeforce6]

The rail is a UTG, and the mount is the one the red dot came with. Called vortex and they're sending me a shim, but I'll have to make a temporary one to sight in hunt this wknd.

I've cut up aluminum cans and use them as a shim. Worked perfectly.

 

[lafn96]

I've cut up aluminum cans and use them as a shim. Worked perfectly.

That's exactly what I was thinking of doing

 

[tnanh]

Vortex are horrible for getting stuck, run it all the way up than down , back up and half way back down and start over, it sounds dumb but most times it frees it up to let you move it on down

This works on a lot of red dots. Smack it hard with the palm of your hand several times while running it up and down also.

 

[MickThompson]

Had a stuck choke tube that I tried everything on and couldn't remove, ordered an 18" barrel for my mossberg 500 and put in a Carlson turkey choke. The new barrel isnt ribbed, so I couldn't switch over the sights. Ordered a rail and a vortex viper red dot, sighted in yesterday and it's hitting about 12" high at 20 yds with the red dot maxed out. A little higher at 40 yds.

If I put a shim under the rear of the rail with the red dot mounted at the front of the rail, should that work?

I think you need to shim the front end of your rail to raise your point of aim to meet point of impact

 

[tnanh]

I've never used vortex they aren't as well known for reliability like a Burris, but I would contact vortex for help or switch to a BurrisFF3 to get rid of all issues and still have a life time warranty

Burris gets stuck too. I have had to do the same fix with two of them.

 

[lafn96]

I think you need to shim the front end of your rail to raise your point of aim to meet point of impact

Yes, you're correct

 

[rem270]

Vortex are horrible for getting stuck, run it all the way up than down , back up and half way back down and start over, it sounds dumb but most times it frees it up to let you move it on down

I came here to say this but the guy who fixed mine already told you! I would try this. I have to try and zero my cousins this afternoon and hope I don't run into this issue.

 

[Andy S.]

I've cut up aluminum cans and use them as a shim. Worked perfectly.

Same here.

 

[knightrider]

I came here to say this but the guy who fixed mine already told you! I would try this. I have to try and zero my cousins this afternoon and hope I don't run into this issue.

Worked like a charm on yours

 

[Southern Sportsman]

I've never had one "stick," so I don't know exactly what that entails. Does the dot still move, but not as much as it should? Or not move at all?

If you look through the sight while turning the dial, can you see the dot move?