AK4D vs SOR-556 Mk2

1998–Present

2004–present

~2,500 units (estimated)

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

29.5–39.8 in (749–1011 mm)

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

10 to 18 inches

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

3.29–3.5 kg (7.3–7.7 lb)

30 rounds standard STANAG, 20/40 round magazines compatible

30-round STANAG

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

Short-stroke gas piston, rotating bolt

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

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

Flip-up iron sights or optics