FMK-3 vs MAC-10

1974–1993

1966–Present

Unknown

~250,000 estimated (including U.S., Brazilian, and Asian licensed production)

605 mm (stock folded) / 805 mm (stock extended)

254 mm (10.0 in) with stock folded; 330 mm (13.0 in) with stock extended

200 mm

127 mm (5.0 in) for 9 mm version; 127 mm (5.0 in) for .45 ACP version

3.05 kg

2.5 kg (5.5 lb) empty, .45 ACP version; 2.3 kg (5.1 lb) empty, 9 mm version

40 rounds

30‑round box magazine standard; 20‑round (compact) and 40‑round (drum) options available

Blowback, telescoping bolt

Straight‑blowback, open bolt, telescoping bolt with simple recoil spring; selective‑fire (semi‑auto and full‑auto)

Single-stage

Single‑stage mechanical trigger with manual safety lever; full‑auto fire only when selector set to "auto"

Fixed front post and flip-up rear aperture

Fixed, low‑profile iron sights: simple blade front post and notch rear; optional aftermarket tritium night sights