M4A1 vs Remington Model 8

1994–Present

1906–1936

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

Approximately 60,000

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

1067 mm

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

559 mm

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

3.6 kg

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

5 rounds

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

Long recoil

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

Single-action

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

Open iron sights