Widening notch on M&P so slightly,shooting to the right...which side of the notch should I take a little off of, left or right (guessing left but I cant remember and they're aint no undoin' it later)...

Have somebody else shoot it . . . .

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Wisdom comes thru fear . . .

Muss is right. Let someone else try it first. I've had days that I would be shooting off to one side and the next time I would be on target. I've only had one revolver, a pre-war M&P that needed the back sight groove trimmed. You could see that the notch was slightly to one side.

Okay, advice is over. Truth is you need to cut the side that you want to move point of impact toward. If you're shooting to the right you need to trim the left side slightly.

Widening the notch is NOT the proper way to make the adjustment you want to make. Please do not do it as it will positively destroy the value of the firearm.

This may or may not be germaine to the discussion, but are we talking about an M&P revolver? There are many M&P's, including my M&P 15-22 (my advice wouldn't change, I'm just curious).

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Wisdom comes thru fear . . .

Wouldn't it be easier to just turn the barrel in the frame a hair one way or the other ? I've seen it done with Colt SAA's and it was fast and easy .

Are we sure the front sight isn't bent?

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Wisdom comes thru fear . . .

Pay attention, this is 100% correct!! You cannot widen the notch enough to make a significant difference! The correct way is be re-regulating the revolver which takes someone knowledgible of the process. The average "gunsmith" hasn't the slightest idea how to do this correctly. You need someone who has been through the S&W Armorers School for revolvers.

For S&Ws turning the barrel is not an acceptable method either.

If you are anywhere near me I will be happy to adjust the gun for you.

If the gun is shooting within 2-3" at 25 yards LEAVE IT ALONE and just adjust your point of aim.

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Gunsmithing since 1961

Danger! Danger! Danger! Stop everything and do not do anything at all until you have read all the above posts and contacted a properly trained S&W Armorer. They wll know how to correctly fix any problem your revolver might have with sighting/regulation. Do not under any circumstances try to mill the rear sight groove to adjust windage. Unless something is really wrong somewhere, your revolver is most likely set up so that POI=POA using ammunition that is standard for the caliber.

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<><

Have you tried altering your grip?

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and what his trumpet saith

We were taught how to do this in the S&W Armorer School. Works like a charm. Note: I would never make this adjustment in the presence of the revolver's owner....don't ask.

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S&W Armorer
Lost in the 50s

If its really, truly off I believe that he factory will bend the barrel a bit using a heavy Babbitt bar.

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-jwk-
US Army '72-'95

Ding! Ding! Yup.

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S&W Armorer
Lost in the 50s

I have cut the rear sight notch wider on a couple of my mod 10s to
correct for shooting off center and it worked like a charm. The two
guns were off 2-3 inches at 50 ft and I brought point of impact to
center. The barrels are pinned so turning them was not an option.
The fixed front sight is not likely to bend. The key is to do it right.
Using ratio, calculate the amount the rear sight needs to move and
the rear notch has to be widened by twice the correction amount.
I set the guns up in a milling machine and very carefully cut the
notch with a very small endmill. If you're not comfortable with doing
this yourself I'm sure there are people who are. Touched up with
cold blue and I'm happy with the results. I have heard of whacking
the barrel with a lead weight but I don't know anything about it but
it's obviously trial and error.