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SureFire
Overview
The SureFire X400 Ultra is a versatile light and laser combo that delivers a powerful 1,000 lumens of light output, providing excellent visibility in low-light situations. It operates with two CR123A 3V Lithium batteries and features a red laser for precise aiming, all housed in a durable aluminum body. This weaponlight is commonly found on builds with a mid-length gas system and chambered in 5.56 NATO, making it ideal for tactical applications and home defense setups.
Specifications
SureFire X400 Ultra 1,000 Lumen Weaponlight with Red Laser
Available Merchants(6)
Prices checked
Price Alert
October 2026 on GunPartPicker
SureFire X400 Ultra 1,000 Lumen Weaponlight with Red Laser ranked #17 of the 101 weapon lights builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #16 of the 234 weapon lights builders have added. Builds with this weapon light are mostly chambered in 5.56 NATO (73%, then 300 Blackout 12%), split between mid-length (41%) and carbine-length (33%) gas systems, and mostly AR-15 (91%).
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 4 of the 6 retailers we track have it in stock. It dipped to $548.99 at Optics Planet for a stretch in October 2026, well under its usual $656, so sales do come around. Buying today, the lowest price is $548.99 at Optics Planet, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Read the guide: AR-15 Weapon Light Guide →Frequently Built With
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Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the SureFire X400 Ultra 1,000 Lumen Weaponlight with Red Laser
| Build | Parts | Total |
|---|---|---|
 | 19 | $2334.77 |
 | 22 | $4640.44 |
 | 28 | $4849.77 |
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