Accuracy International AXMC vs M4A1

2010–Present

1994–Present

~15,000 estimated

~10,000,000+ units (including all variants and licensed production)

1,050 mm (41.3 in) with stock extended, 970 mm (38.2 in) with stock collapsed

838 mm (33.0 in) stock extended, 756 mm (29.8 in) stock collapsed

406 mm (16 in) standard, 508 mm (20 in) optional for .338 Lapua, 254 mm (10 in) for .308 variants

368 mm (14.5 in) standard; 406 mm (16 in) for the M4A1 SOPMOD variant

5.6 kg (12.3 lb) empty, 6.2 kg (13.7 lb) with 20‑round .338 Lapua magazine

3.07 kg (6.8 lb) empty, 3.74 kg (8.2 lb) with full 30‑round magazine

10‑round detachable box standard for .308/.300 Win Mag, 5‑round for .338 Lapua, 7‑round for .300 Norma Magnum

30 rounds standard STANAG, 20‑round low‑profile, 40‑round drum, 60‑round Beta‑C‑Mag available

Bolt‑action with three‑locking‑lugs, 60° bolt lift, interchangeable bolt head for different cartridges, fully enclosed receiver

Short‑stroke gas piston (M4A1 variant) with rotating bolt; original M4 uses direct‑impingement

Adjustable two‑stage trigger, pull weight 0.5–1.0 kg (1.1–2.2 lb) selectable

Two‑stage military trigger, full‑auto only selector on M4A1; semi‑auto on standard M4

Standard: detachable Picatinny rail for optics, optional low‑power variable 1‑10× scope; backup: flip‑up iron sights on detachable rail

Standard: A2 front post and rear flip‑up aperture; optional: MIL‑STD-1913 Picatinny rail for aftermarket optics, tritium night sights, or holographic sights