FALL BUILD FEST IS ON - Shop Exclusive Deals & Offers!
+ 12% Off Select AR15 Parts Use Code: ARBUILD12

FALL BUILD FEST IS ON - Shop Exclusive Deals & Offers!
+ 12% Off Select AR15 Parts Use Code: ARBUILD12

Daily Deal - Barnes Precision Match 85gr OTM 5.56 ~~$36.99~~ $30.99 - Get Yours!

SMITH & WESSON SIGHT NUT SPANNER Reviews & Ratings

SMITH & WESSON SIGHT NUT SPANNER 2 PACK

MAGNA-TIP® Bit, made to fit the windage nut that secures the S&W rear sight leaf. To use: Drill out staking, hold nut with Spanner and unscrew the screw. To install: Hold new nut with Spanner and seat screw. Always turn the screw; never the nut. Because it is fragile, and can break if you turn it, the Spanner is not guaranteed against breakage.

SPECIFICATIONS:

2 Hardened Steel MAGNA-TIP Bits
Purposely Shaped for S&W Rear Leaf Sight Windage Nut
Length: 1-1/4"
1/4" Drive

View Product

Write a review

Reviews Summary

Reviews for the SMITH & WESSON SIGHT NUT SPANNER highlight a mix of positive experiences and significant frustrations. While some users found the tool effective when used correctly, a notable portion reported breakage and sizing issues, suggesting that caution is needed when using this product. Many credit the value of the tool, despite recognizing its fragility.

What Reviewers Are Saying

Effectiveness

34%

Many reviewers found the spanner to be effective for its intended purpose when used correctly and with care. Those who followed the instructions reported successful changes to their rear sights, citing the tool as useful in tightening or adjusting the nuts on their firearms.

Fragility

53%

A significant number of users express concerns about the tool's fragility. Reviews commonly mention that the prongs bent or broke with minimal pressure, leading to frustration during use. This theme indicates a widespread recognition that the tool requires a delicate touch to avoid damage.

Sizing Issues

32%

Several reviewers reported that the spanner did not fit the nuts properly, with comments about the prongs being too thick or the overall size being inappropriate for certain models. This issue led some users to modify the tool for it to be effective, which detracted from its ease of use.

Need for Modification

37%

Reviewers frequently mentioned the need to modify the spanner for it to work effectively, suggesting that alterations such as trimming prongs or adjusting sizes were necessary. This chronic need for adjustments highlights a common dissatisfaction with the tool's initial design.

Sort by Filter by rating

Disappointed

Bought these to change the rear sight blade on my S&W Model 19. Both bent and then broke while trying to remove the nut. Finally out of frustration I just took the gun toa gun smith!

by JAY S. on September 07, 2025

Verified Purchase

Was this review helpful? 0

Spanner

Honestly, I didn't even need these. I replaced the rear sight blade on my S&W 686 and thought I'd need this special tool. The spanner didn't even fit the slots on the nut. Not to worry though, this nut spanner is not even needed to complete the job.

by DANIEL R. on November 24, 2023

Verified Purchase

Was this review helpful? 1

Not good, but worked.

Bought this to replace a model 48 rear sight. As soon as I tried to turn the nut the prongs bent immediately. After that it was useless. I took a pair of wire cutters cut down most of it. Took a chainsaw triangular file and reshaped the notch in the bit. Filed the sides to make it a little thinner and worked fine. Shouldnt have to do this. The prongs need to be a lot shorter to begin with. At least it gave me something to work with. Would only recommend if your willing to modify the tool.

Not great

The tool was of no practical use. The prongs did not fit the retaining nut on the sight. The diameter was too large.

Not really the right tool for the job

This is not the right tool for the Smith and Wesson revolver rear sight spanner nut. The blade tips do NOT fully seat into the spanner nut slots because the tips are too thick. Yes, it can be made to work. Also, the legs are much too long, making the tool more fragile than it needs to be. But, since Smith and Wesson no longer offers the correct tool to the public, I guess this is the best we can get. Good luck not ruining the spanner nut or breaking the spanner tool.

Fragile aint no joke

There's 2 in the pack, one was slightly bent, tried to straighten it and it broke with almost no effort. Ran the new screw through the sight to check the fit and the screw sheared. So I'm ordering a new sight, screw, and another pair of these little wrenches so I have 3 tries to get it right. I would try something else but there isn't anything else.