Fenix GL23R vs SureFire X300U-A size comparison
The SureFire X300U-A is 8.5 mm (0.33 in) longer than the Fenix GL23R, and 14.4 mm narrower at its widest point. It is 7 g lighter (with battery).
The SureFire X300U-A is 8.5 mm (0.33 in) longer than the Fenix GL23R, and 14.4 mm narrower at its widest point. It is 7 g lighter (with battery).
Dimensions
| Fenix GL23R Check price ↗ | SureFire X300U-A Check price ↗ | |
| Length | 87 mm (3.43 in) | 95.5 mm (3.76 in)+8.5 mm |
| Height | 43 mm (1.69 in) | 28.6 mm (1.13 in)−14.4 mm |
| Thickness | 30 mm (1.18 in) | 28.6 mm (1.13 in)−1.4 mm |
| Weight | 120 g with battery | 113 g with batteries−7 g |
| Battery | 18350 | 2x CR123A |
| Max output | 1,200 lm | 1,000 lm |
| Throw | 240 m | 213 m |
| Type | Weapon light | Weapon light |
| Price | $139.95 at fenixlighting.com, as of Nov 4, 2026 | $379.00 at surefire.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | surefire.com sourced SureFire publishes length and bezel diameter only (drawn at bezel height); throw computed from 11,300 cd peak intensity |
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
GL23R vs X300U-A: how they differ
Size and weight
The Fenix GL23R is the shorter light: 87 mm (3.43 in) against 95.5 mm (3.76 in), a difference of 8.5 mm (9%). At its widest point the SureFire X300U-A is 14.4 mm slimmer (28.6 vs 43 mm). The SureFire X300U-A is 7 g lighter (113 g vs 120 g, with battery).
Brightness and throw
The Fenix GL23R is rated brighter: 1,200 lm maximum vs 1,000 lm for the SureFire X300U-A, 20% more. For beam distance the Fenix GL23R reaches further: 240 m vs 213 m rated throw (13% more).
Battery
The Fenix GL23R runs on a removable 18350 battery; the SureFire X300U-A runs on removable 2x CR123A batteries. For scale, a 18350 cell is about 18 × 35 mm and a CR123A about 17 × 34.5 mm (nominal).
Price
When we checked on Nov 4, 2026, the Fenix GL23R was $139.95 at fenixlighting.com and the SureFire X300U-A $379.00 at surefire.com, so the Fenix GL23R cost $239.05 less. Prices change often, so check the current price before you buy.
Type
Both are weapon lights in our catalog with a weapon body.
Which should you buy?
Choose the Fenix GL23R if you want a shorter light (8.5 mm shorter), more output (1,200 lm vs 1,000 lm) and longer throw (240 m vs 213 m). Choose the SureFire X300U-A if you want a slimmer profile (14.4 mm narrower) and less weight (7 g lighter). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix GL23R Check price ↗ SureFire X300U-A
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
GL23R vs X300U-A FAQ
Which is smaller, the Fenix GL23R or the SureFire X300U-A?
The Fenix GL23R is the shorter light: 87 mm (3.43 in) against 95.5 mm (3.76 in), a difference of 8.5 mm (9%). At its widest point the SureFire X300U-A is 14.4 mm slimmer (28.6 vs 43 mm). The SureFire X300U-A is 7 g lighter (113 g vs 120 g, with battery).
Which is brighter, the Fenix GL23R or the SureFire X300U-A?
The Fenix GL23R is rated brighter: 1,200 lm maximum vs 1,000 lm for the SureFire X300U-A, 20% more. For beam distance the Fenix GL23R reaches further: 240 m vs 213 m rated throw (13% more).
Which is cheaper, the Fenix GL23R or the SureFire X300U-A?
When we checked on Nov 4, 2026, the Fenix GL23R was $139.95 at fenixlighting.com and the SureFire X300U-A $379.00 at surefire.com, so the Fenix GL23R cost $239.05 less. Prices change often, so check the current price before you buy.
Do the Fenix GL23R and SureFire X300U-A use the same battery?
The Fenix GL23R runs on a removable 18350 battery; the SureFire X300U-A runs on removable 2x CR123A batteries. For scale, a 18350 cell is about 18 × 35 mm and a CR123A about 17 × 34.5 mm (nominal).
Compare Fenix GL23R with similar lights
Compare SureFire X300U-A with similar lights
More
Sources
- Fenix GL23R: specs from Fenix product page (manufacturer). Price $139.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- SureFire X300U-A: specs from SureFire product page (manufacturer). Price $379.00 from surefire.com, checked Nov 4, 2026; prices change often.
Found an error? Email liambuehlerbusiness@gmail.com and we will fix it.