Red Dot adjustment

GoCarp · December 7, 2016, 06:20 PM

I have an S&W 69 with a Burris Fast Fire 3. I have run out of adjustment and I'm still a couple inches off. Also, it will not co-witness with my factory front post, but that's not as big of a concern. Any thoughts?

I'm using the Allchin mini-sts mount.

Snyper · December 8, 2016, 05:41 AM

I don't think you will find a lot of optical sights that are designed for a 7 yard zero.

I'd forget about "co-witnessing" and just use the red dot sights, which are probably dead on at normal distances.
The two shots are only about an inch apart anyway.

Also try some different loads to change the POI

Roughedge · December 8, 2016, 07:24 AM

Check your mount and make sure its right, then you can take some shim stock and bend it the right shape and shim the left front corner of the sight. that should give you a bit more adjustment.

NoSecondBest · December 8, 2016, 09:36 AM

Snyper is spot on. I have red dots on most of my guns and have used them for over twenty-five years. I can't add anything to his comments. Shimming for seven yards is a waste of time and effort.

g.willikers · December 8, 2016, 10:26 AM

Red dot sights were originally adopted by the fast shootin' crowd.
Large targets and speed are the norm there.
They have become popular for other types of shooting, but not always having their limitations.

Slopemeno · December 8, 2016, 12:52 PM

You could shim the rear of the mount.

Have you ever seen a scope shim? They are stamped out of very thin stock, so it isn't a permanent change. Cut it with scissors to fit the area under the rear of the mount, and reassemble.

I'd probably try 50 feet first.

NoSecondBest · December 8, 2016, 01:42 PM

You can make a shim out of anything except paper. Paper gets wet and disintegrates. Use plastic off of a bubble pack product or cut some aluminum from a pop can to make a shim. You can buy shim stock but it's about as easy to make it yourself. Again, for shooting at seven yards it's not really accomplishing anything....at least not for defensive purposes.

weaselfire · December 8, 2016, 02:05 PM

At seven yards, why use sights? Point shooting will put you on target.

Jeff

Sent from my XT1254 using Tapatalk

GoCarp · December 8, 2016, 10:18 PM

Thanks all. I appreciate the responses. I think I saw that beer cans can make good shims at about 0.005" thick.

I also may try moving back to 50 yds first and see where I end up. I was already at the shorter pistol range bay that day and thought I would start sighting it in. I do plan to move it back to 50yds or so as I plan to use this for hunting.

Chainsaw. · December 9, 2016, 11:58 AM

Ah. In that case I bet she'll get back in range of adjustment. At 7 yards Id expect to be low and inch.

NoSecondBest · December 9, 2016, 02:34 PM

Quote:

I think I saw that beer cans can make good shims at about 0.005" thick.

The only thing that makes beer cans better for shims than soda cans is the contents. I bet you end up making a lot of shims

December 7, 2016, 06:20 PM	#1
GoCarp Junior Member Join Date: December 3, 2011 Posts: 7	Red Dot adjustment I have an S&W 69 with a Burris Fast Fire 3. I have run out of adjustment and I'm still a couple inches off. Also, it will not co-witness with my factory front post, but that's not as big of a concern. Any thoughts? I'm using the Allchin mini-sts mount.

December 8, 2016, 05:41 AM	#2
Snyper Senior Member Join Date: December 16, 2013 Location: Eastern NC Posts: 3,047	I don't think you will find a lot of optical sights that are designed for a 7 yard zero. I'd forget about "co-witnessing" and just use the red dot sights, which are probably dead on at normal distances. The two shots are only about an inch apart anyway. Also try some different loads to change the POI __________________ One shot, one kill

December 8, 2016, 07:24 AM	#3
Roughedge Senior Member Join Date: January 24, 2011 Location: Monroe,NC Posts: 669	Check your mount and make sure its right, then you can take some shim stock and bend it the right shape and shim the left front corner of the sight. that should give you a bit more adjustment. __________________ The man that die's with the most stuff win's!

December 8, 2016, 10:26 AM	#5
g.willikers Senior Member Join Date: September 28, 2008 Posts: 10,442	Red dot sights were originally adopted by the fast shootin' crowd. Large targets and speed are the norm there. They have become popular for other types of shooting, but not always having their limitations. __________________ Walt Kelly, alias Pogo, sez: “Don't take life so serious, son, it ain't nohow permanent.”

December 9, 2016, 11:58 AM	#10
Chainsaw. Senior Member Join Date: September 12, 2015 Location: Issaquah WA. Its a dry rain. Posts: 1,774	Ah. In that case I bet she'll get back in range of adjustment. At 7 yards Id expect to be low and inch. __________________ Just shoot the damn thing.

December 8, 2016, 09:36 AM	#4
NoSecondBest Senior Member Join Date: December 7, 2009 Location: Western New York Posts: 2,736	Snyper is spot on. I have red dots on most of my guns and have used them for over twenty-five years. I can't add anything to his comments. Shimming for seven yards is a waste of time and effort.

December 8, 2016, 12:52 PM	#6
Slopemeno Senior Member Join Date: January 19, 2007 Posts: 2,663	You could shim the rear of the mount. Have you ever seen a scope shim? They are stamped out of very thin stock, so it isn't a permanent change. Cut it with scissors to fit the area under the rear of the mount, and reassemble. I'd probably try 50 feet first.

December 8, 2016, 01:42 PM	#7
NoSecondBest Senior Member Join Date: December 7, 2009 Location: Western New York Posts: 2,736	You can make a shim out of anything except paper. Paper gets wet and disintegrates. Use plastic off of a bubble pack product or cut some aluminum from a pop can to make a shim. You can buy shim stock but it's about as easy to make it yourself. Again, for shooting at seven yards it's not really accomplishing anything....at least not for defensive purposes.

December 8, 2016, 02:05 PM	#8
weaselfire Member Join Date: January 12, 2013 Posts: 88	At seven yards, why use sights? Point shooting will put you on target. Jeff Sent from my XT1254 using Tapatalk

December 8, 2016, 10:18 PM	#9
GoCarp Junior Member Join Date: December 3, 2011 Posts: 7	Thanks all. I appreciate the responses. I think I saw that beer cans can make good shims at about 0.005" thick. I also may try moving back to 50 yds first and see where I end up. I was already at the shorter pistol range bay that day and thought I would start sighting it in. I do plan to move it back to 50yds or so as I plan to use this for hunting.