Adjusting the Rear Sight on an S&W Semi-Auto Pistol
Adjusting the rear sight on an S&W semi-auto pistol is usually a small windage correction. Many M&P-pattern handguns use a drift-adjustable rear sight, while certain variants have a push-pull sight and others are fixed. Identifying the mechanism prevents damage and keeps the work within the instructions for the exact firearm.
In Australia, the practical target is usually 25 metres rather than 25 yards. Sights marked 1, 2 or 3 often use yards, so a 10-metre bench check and an outdoor 25-metre group serve different purposes. Range access and calibre choices vary between Sydney, Melbourne, Brisbane and many regional clubs.
Licensing is equally local. NSW shooters navigate a firearms licence and transport requirements, Victoria uses its own permit system, and other states and territories apply distinct rules. Australian Border Force controls firearms entering the country, so an overseas purchase needs relevant customs and state approvals before shipment regardless of a retailer’s worldwide-delivery claim.
A repeatable process is safer than guessing: unload and inspect, establish a firm firing position, take a baseline group, change the sight in tiny increments, then verify at the intended distance. A local gunsmith or club member can confirm whether the rear sight is intended to be adjusted and help with unfamiliar setups.
Identify the sight before touching it
Start with the model designation and serial number, then compare the rear assembly with the manual. A slotted screw beside a white dot or notch does not automatically mean it should be turned like an elevation screw. The sight may be held by a locking mechanism that must be released first.
On many M&P 9mm and .40 S&W pistols, the rear blade sits in a short dovetail and offers windage adjustment. Other S&W semi-autos use a tool-free push-pull rear, while fixed or aftermarket versions cannot be adjusted in the usual way. The M&P family includes different sight systems, so its name alone is not enough.
Treat online material with the same discipline you would apply to the conditions attached to a promotional bonus guide: check the exact model, revision and tool called for. Photograph the original sight, note its position and stop if the blade binds, the screw turns unevenly or the dovetail shows signs of forcing.
Work unloaded and keep the pistol controlled
Make mechanical changes with the pistol unloaded. Confirm the chamber and magazine are empty, keep the muzzle in a safe direction and place the pistol on a stable surface. A slide lock protects the finish, but it never substitutes for checking the chamber.
Use the driver specified by Smith & Wesson or the manual. Correct fit matters because a slipping bit can strip the screw and turn a simple adjustment into a repair. Release or turn the fastener gently, support the blade and make only the movement described in the instructions.
At a range, follow the range officer’s commands, wear eye and hearing protection and use a safe backstop. Do not alter the sight while the pistol is loaded unless the manufacturer permits it. Keep the firearm pointed safely, load only when directed and unload again when the firing line gives the signal.
Establish a repeatable baseline
Begin a sighting-in session on a measured line at 10 metres, then verify at 25 metres. Ten metres reveals a gross zero error, while 25 metres matches the usual Australian zero and exposes smaller point-of-aim differences. Do not assume a sight marked “3” is set for 25 metres because its unit is yards.
Keep your stance, grip, cheek position and trigger press consistent between strings. Fire several five-shot groups rather than judging one shot, and record the centre of mass and spread. A tight group offset from the aiming point points to sight alignment; a scattered group calls for grip, stance or ammunition checks first.
The local market generally offers 9mm more readily than .40 S&W, and some .22 variants vary between Australian gun shops and clubs. Use a consistent ammunition load because different bullet weights and velocities can change point of impact. A club marshal or gunsmith can separate an equipment problem from an inconsistent shooting position.
Make the first windage correction
Read the group from the intended aiming point toward the centre of the impacts. If the group sits right, move the rear sight right; if it sits left, move the sight left. The rear sight moves toward the observed group, while the group should move oppositely toward the intended point.
Use the smallest useful increment and follow the manual for what it means. A “click” is not a universal unit, and screw markings on different S&W models may not correspond. If the manual specifies a quarter-turn, make one, record it and shoot another string; otherwise move the blade only enough for a controlled shift.
Windage is the usual adjustment on a conventional S&W rear sight. Raising the front sight to move impacts down is a different procedure that can affect sighting geometry. If the change is large, the front sight is damaged or the rear sight will not hold position, have a qualified gunsmith inspect the pistol.
Do not chase a single flyer. Group centre and the repeatable pattern carry more information than the furthest round, especially on a semi-auto where one unusual press can create an outlier. If impacts alternate markedly, check slide and frame alignment, magazine seating and whether the rear sight has moved.
Keep a practical adjustment record
A simple range card makes each correction repeatable and shows whether the sight is holding. Record the sight position, distance, ammunition and group centre separately for the session and each group.
Before the session, capture the baseline:
- Record the pistol model, rear-sight style and current windage position.
- Confirm the manufacturer’s adjustment method and required tool.
- Choose a measured distance and safe target with room for windage corrections.
- Use one ammunition load and note its bullet weight and projectile type.
- Establish a consistent grip, stance, sight picture and trigger press.
After each group, update the record:
- Mark the intended aiming point and calculate the group’s centre of mass.
- Move the rear sight toward the observed group in the smallest permitted increment.
- Note the direction, amount and reason for every adjustment.
- Record group size, extreme spread and any mechanical issue noticed.
- Repeat the same distance and firing position before confirming the result.
Compare the final card with the earlier baseline rather than relying on memory. If the pistol returned to the same impact point after each correction, the setting is probably stable. If it wandered, inspect the sight hardware, repeat a shorter test at 10 metres, then return to 25 metres.
Confirm zero and record the result
After the 25-metre verification group, the centre of the impacts should match the intended point of aim closely enough for the intended use. Keep the final setting, ammunition and distance together, since a later change in load, barrel or optic can alter the result. A practical zero can differ from a competition zero, so define the purpose before fine adjustments.
Rear sight arrangements differ enough that the operating method matters:
| Rear sight arrangement | Typical adjustment method | Main control | Important caution |
|---|---|---|---|
| Drift-adjustable blade | Release or loosen the windage mechanism and move the blade in its dovetail | Horizontal point of aim | Support the sight and never force the dovetail |
| Screw-set adjustable sight | Turn the designated screw according to the manual | Horizontal point of aim | Do not assume clockwise and anticlockwise move the same way on every model |
| Push-pull or tool-free sight | Apply controlled thumb pressure to the rear blade | Small horizontal point-of-aim changes | Feel for the detent and avoid levering the blade sideways |
| Fixed rear sight | No user windage adjustment | None on the pistol | Use an approved sighting solution or seek gunsmith advice |
One further controlled group at the original distance confirms that the adjustment did not hide a grip or consistency problem. Record the result and note that it applies only to the ammunition and setup tested. A local gunsmith is valuable when the sight is aftermarket, the dovetail is worn or the required movement exceeds the normal range.
Before the next session, write the current rear-sight position, ammunition details and 25-metre centre-of-mass result on the range card.