Wringing out Tech Sights on a 10/22

[Superheat]

Saturday was spent with a good friend at a rifle range.  #6 and I were able to test my son's tech sights.  Being a guy who 'believes it when he sees it', I wanted to measure out the MOA/click on a set of tech-sights for myself.  To say there is a lot of conflicting information on tech sights is an understatement. 

Disclaimer- The measurements we made were the best we could do in a rough field environment.  We made little attempt to duplicate them.  My eyes are... well.. they suck. 

Here's what we used:
CCI mini mag ammunition.
My son's Ruger 10/22 with a youth stock 22-3/4" sight radius (I believe a 16.12 barrel) Your are right mac it is 18"
Bench rested.
25 yds
TSR200 Tech sights
Custom veterinary tape wrap.   

Our findings were different from the Tech site website  http://www.tech-sights.com/faq.htm

Front sight elevation: 1 MOA/click.
It came out exactly 1.00000.  Wow.  How cool.  The military should do that on their sights.

Rear sight windage: .833 MOA/click 
Not as cool.  roughly 27/32? almost 7/8 and that is close to 1 right?

Rear sight elevation: .875 MOA/click
Ok.. That is 7/8 and that is close to 1.

On my son's rifle I can go with 1 MOA/click and be darn close.  Now if it is a big adjustment I will take off one moa for every 8 on the rear sight.  This is certainly different than the 5/8 or 1/2 that I have heard in the past.

One more thought... A different sight radius will affect the values.  A longer sight radius (distance between the front and rear sight) will reduce the value.  If you have different reading PLEASE post them and how you came up with the data.  Don't be afraid you are among fellow geeks.   

[ITB]

Wow, nice groups. From a bench?   

Thanks for posting.  Useful info.

[mac66]

If I recall from the YM seed we did,  your son's rifle had a standard 18" bbl not a 16".   I have a 20" bbl on one of my 10/22s with Tech Sights, now I'm going to have to gage mine.

[yellowhousejake]

I have a 18 16 " barrel and one minute per click is what mine has shown hundreds of times as a loaner, and what I have been telling students for over two years. Up to 100 yards, one minute per click will get them in the black.

YHJ

Edited because I can't type.

[draken]

Good timing! I have a 16.5" barrel on my 10/22 and I was planning on measuring my teach sights next time I hit the range. I'll post back the results...

Nice groups!

[Superheat]

Here is our friend Larry showing how to measure a barrel length.

http://www.youtube.com/watch?v=Wi6kVI8ckqY


I guess it is actually 18-1/2".

[Charles McKinley]

Now if they would just put on the sight what direction to turn them for desired effect!

Not that I have ever adjusted the windage the wrong direction or anything.

[Guntuckian]

Mnemonic that I use for TSR100 Tech-sights on a 10/22 is:  "UP RIGHT IS RIGHT".

That is,

Moving impact UP on front sight IS RIGHT!  (CW)

Moving impact RIGHT on rear sight IS RIGHT!  (CW)

Mnemonic works for me

[jmdavis]

Now if they would just put on the sight what direction to turn them for desired effect!

Not that I have ever adjusted the windage the wrong direction or anything.

Use a paint pen to mark your directions on the rear and you can make witness marks for your 25m zero elevation and windage.

Once zeroed I do not move the front unless I lack enough rear elevation.

[D.O.M.]

heh, I just did the same thing on my loaner 795. I did shoot only 2 groups, but I came up with .8 moa per click. (only braved the mosquitos long  enough to check elevation).
I use a vibra-tool to engrave the directions on my sight, cuz my memory is too short!

[Caliper]

heh, I just did the same thing on my loaner 795. I did shoot only 2 groups, but I came up with .8 moa per click. (only braved the mosquitos long  enough to check elevation).
I use a vibra-tool to engrave the directions on my sight, cuz my memory is too short!

The labels on that rifle are pretty slick!  .8 agrees with what I remember calculating using my calipers.  Gotta find that spreadsheet somewhere... 

I have found that on the longer barreled Remington 597, the clicks come out to about 0.75 MOA. 

Being an engineer, I just remember that Tech Sights rear sight follow the left hand rule (like AR rear sights) good thing is I always have my left hand with me!  Point your left thumb in the direction you want the sight to move and when you curl your fingers, they will be moving in the direction to turn the knob.  Take a look at the attachment.  Try it, it works! 

(BTW: most scopes follow the right hand rule, which is the same idea but with your right hand) 

[Lakevillian]

"  Point your left thumb in the direction you want the sight to move and when you curl your fingers, they will be moving in the direction to turn the knob"

Does that mean that using your right thumb indicates which direction your point of impact will go?

John

[Caliper]

Does that mean that using your right thumb indicates which direction your point of impact will go?

John

No.  Because this is the rear sight, your thumb will be pointing both in the direction the sight moves and the direction the impact moves. 

In the Tech Sight world, an adjustable front sight is only available on the TS100 which is only available for the 10/22.  Because the TS100 front sight is an AR15 post, the left hand rule will work for moving point of impact with the front sight as well. 

[Charles McKinley]

Guntuckian thanks for the menomic.  I will engrave my personal rifle.  Others may be touchy about it.  Engraving my zero will save time as well after it gets moved around as a loaner.

[mac66]

I use a White Out pen (typewriter-remember them-correction fluid) to mark sights and put info on rifle as to which way the knobs are supposed to go. Lasts a long time (years) but scrapes off with a fingernail.

[Kelso]

Your results agree with my experience that the adjustment on tech sights is much coarser than advertised.  Instead of adjusting 5/8 moa per click, I calculate at 1 moa per click and 1/2 minute per click and use the average (.75 moa per click).  This has always worked for me on Marlin 795s and 10/22s.