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Sightmark
Overview
The Sightmark Laser Boresight for 40 S&W Pistols is designed to help you quickly and accurately align your firearm's sights. Utilizing a boresight laser, this tool allows builders to ensure their optics are perfectly zeroed before live firing, saving both time and ammunition. While this specific boresight is tailored for 40 S&W pistols, builders often integrate similar sighting tools in AR-15 setups, particularly those configured with a Mid-Length gas system and chambered in 5.56 NATO.
Sightmark Laser Boresight for 40 S&W Pistols - SM39016 was the third most added laser on GunPartPicker in August 2026, behind the Steiner Optics DBAL-A3 Dual Beam Aiming Laser with IR LED Illuminator - Black, with about 4% of all lasers added to builds. Up from #5 in July. Builds with this laser are mostly chambered in 5.56 NATO (83%, then 9mm 17%), split between mid-length (50%) and rifle-length (33%) gas systems, and mostly AR-15 (78%, then AR-10 11%).
It was in stock most days in August 2026, and today 4 of the 5 retailers we track have it in stock. It dipped to $29.99 at Brownells for a stretch in August 2026, well under its usual $35.97, so sales do come around. Buying today, the lowest price is $35.97 at Brownells, above August's low of $29.99, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
We ranked every laser by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Laser & Aiming Device Guide →The part most often added in each category by the 72 builds that include this one
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Sightmark Laser Boresight for 40 S&W Pistols - SM39016
| Build | Parts | Total |
|---|---|---|
 | 27 | $4208.78 |
 | 17 | $1686.80 |
 | 25 | $4842.82 |
 | 34 | $4774.83 |
 | 11 | $607.90 |
 | 22 | $2003.32 |
 | 19 | $5089.17 |
 | 17 | $2991.17 |
| 26 | $2421.45 |
2 global ratings
Top reviews
Sightmark boresight in 40 S and W has a side mounted switch that activates the laser cleanly. Drops into the chamber and projects the dot on a 25 yard target without firing a round. Saves significant ammo when initially zeroing optics.
Sightmark boresight for 40 S and W gets you on paper without burning ammo. Drops into the chamber, the red dot shows up on a target at 25 yards in normal indoor lighting. Battery lasts a long time with intermittent use. Saves time and ammo when zeroing a new sight.
