Convoy M21B vs SureFire EDC2-DFT size comparison
The SureFire EDC2-DFT is 8.5 mm (0.33 in) longer than the Convoy M21B, and 3.7 mm narrower at its widest point. Weights are published on different bases (listed vs listed), so compare them with care.
The SureFire EDC2-DFT is 8.5 mm (0.33 in) longer than the Convoy M21B, and 3.7 mm narrower at its widest point. Weights are published on different bases (listed vs listed), so compare them with care.
Dimensions
| Convoy M21B Check price ↗ | SureFire EDC2-DFT Check price ↗ | |
| Length | 141.5 mm (5.57 in) | 150 mm (5.91 in)+8.5 mm |
| Head / width | 35.7 mm (1.41 in) | 32 mm (1.26 in)−3.7 mm |
| Body | 27.1 mm (1.07 in) | — |
| Weight | 120 g listed | 159 g listed |
| Battery | 21700 | 18650 |
| Max output | — | 700 lm |
| Throw | — | 632 m |
| Type | EDC | EDC |
| Price | $48.99 at flashlightgo.com, as of Nov 4, 2026 | from $287.00 at batteryjunction.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | batteryjunction.com sourced Only head diameter listed |
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M21B vs EDC2-DFT: how they differ
Size and weight
The Convoy M21B is the shorter light: 141.5 mm (5.57 in) against 150 mm (5.91 in), a difference of 8.5 mm (6%). At its widest point the SureFire EDC2-DFT is 3.7 mm slimmer (32 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; SureFire EDC2-DFT: 159 g listed), so they are not directly comparable.
Brightness and throw
The SureFire EDC2-DFT is rated at 700 lm; we have no published maximum for the Convoy M21B. Output for the Convoy M21B depends on the LED option chosen.
Battery
The Convoy M21B runs on a removable 21700 battery; the SureFire EDC2-DFT runs on a removable 18650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Price
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the SureFire EDC2-DFT from $287.00 at batteryjunction.com, so the Convoy M21B cost $238.01 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Convoy M21B if you want a shorter light (8.5 mm shorter). Choose the SureFire EDC2-DFT if you want a slimmer profile (3.7 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Convoy M21B Check price ↗ SureFire EDC2-DFT
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
M21B vs EDC2-DFT FAQ
Which is smaller, the Convoy M21B or the SureFire EDC2-DFT?
The Convoy M21B is the shorter light: 141.5 mm (5.57 in) against 150 mm (5.91 in), a difference of 8.5 mm (6%). At its widest point the SureFire EDC2-DFT is 3.7 mm slimmer (32 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; SureFire EDC2-DFT: 159 g listed), so they are not directly comparable.
Which is cheaper, the Convoy M21B or the SureFire EDC2-DFT?
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the SureFire EDC2-DFT from $287.00 at batteryjunction.com, so the Convoy M21B cost $238.01 less. Prices change often, so check the current price before you buy.
Do the Convoy M21B and SureFire EDC2-DFT use the same battery?
The Convoy M21B runs on a removable 21700 battery; the SureFire EDC2-DFT runs on a removable 18650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Convoy M21B with similar lights
Compare SureFire EDC2-DFT with similar lights
More
Sources
- Convoy M21B: specs from manufacturer published specs as listed by flashlightgo.com. Drawing: outline from published specs. Price $48.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- SureFire EDC2-DFT: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price from $287.00 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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