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MPT-55 vs SIG SG 551
Side-by-side technical comparison
SIG SG 551
RiflesDiscontinued
Overview
Spec
MPT-55
SIG SG 551
Production
2017–Present
1990–present
Units produced
Thousands (exact figures not publicly available)
Approximately 30,000
Specifications
Spec
MPT-55
SIG SG 551
Overall length
810 mm (31.9 in) stock extended, 730 mm (28.7 in) stock collapsed for MPT-55; 720 mm (28.3 in) stock extended, 640 mm (25.2 in) stock collapsed for MPT-55K
833 mm (stock extended)
Barrel length
368 mm (14.5 in) for MPT-55, 279 mm (11 in) for MPT-55K
363 mm
Weight
3.0 kg (6.6 lb) empty for MPT-55, 2.9 kg (6.4 lb) empty for MPT-55K
3.20 kg
Magazine capacity
30 rounds standard
30 rounds
Action type
Gas-operated, rotating bolt
Gas-operated, rotating bolt
Trigger type
Selective fire (semi-automatic, full-automatic)
Selective fire
Sights
Adjustable iron sights, Picatinny rail for optics
Diopter rear, post front
Calibers
MPT-55
SIG SG 551