Sight Set Question


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9mmepiphany
March 12, 2013, 04:41 PM
I usually just shoot whichever sights come on a gun...except Glocks...fairly well, with the only usual modification being blacking out any rear dots. But I've gotten to the point with my M&P9 that the factory sights aren't cutting it anymore...so I decided to replace them.

I vaguely remember a mathematical equation to determine impact deltas corresponding to sight height deltas, but I'm having a brain fart...plus I've gotten pretty lazy over the years. So, onto my question.

I've been looking at the 10-8 sight set which says that the correct pairing for the full size M&P is a .160" front sight (fiber optic)...I'm looking at a .100" width. So I happen to be on Speed Shooter's Specialties and found they they sell the 10-8 rear for a bit less...and I can save on shipping when combining it with other purchases.

But they don't carry the 10-8 front sight set. What they offer are front sights by Dawson Precision..OK, they're a good company. But they don't offer a .160" front sight in the .100" width...they do have a .115" wide in .160" height

What they do offer in the .100" width is .155" or .170".

The question would be how much impact change would you expect, at 20-25 yards (IDPA), with a front sight that is either .005" taller or shorter?

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mgmorden
March 12, 2013, 04:54 PM
Dawson Precision provides a page for it on their site that explains the equation:

http://www.dawsonprecision.com/images/Instructions/FrontSightHeightChooser.png

9mmepiphany
March 13, 2013, 01:37 PM
Thanks.

That was relatively painless, especially using Reverse Polish Notation in my HP calculator (yup, I'm old)

So, I'm only looking at a POI change of .55" @ 20 yards. I'm thinking a little high is better than a little low...plus, who'd notice in a 3" group ;)

waktasz
March 15, 2013, 04:41 PM
They will make you whatever height you need, assuming they already make the width you require.

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