AK4D vs M4A1

1998–Present

1994–Present

~2,500 units (estimated)

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

950 mm (37.4 in) with stock extended, 770 mm (30.3 in) folded

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

508 mm (20 in) standard, 406 mm (16 in) for AK4 base model

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

3.45 kg (7.6 lb) empty, 3.75 kg (8.3 lb) with bipod and optics

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

30 rounds standard STANAG, 20/40 round magazines compatible

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

Short‑stroke gas piston, rotating bolt, closed‑bolt operation

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

Two‑stage military trigger, adjustable pull weight for designated‑marksman role

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

Standard AK4 iron sights (adjustable rear aperture, hooded front post) plus provision for 4×24 telescopic sight and optional flip‑up night sights

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