Sig Sauer M400. 5.56 Nato, .223 Rem. 16"

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Sig Sauer M400. 5.56 Nato, .223 Rem. 16"
Sig Sauer M400. 5.56 Nato, .223 Rem. 16" Sig Sauer M400. 5.56 Nato, .223 Rem. 16"
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Sig Sauer
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SKU 002240
  • 5.56 Nato
  • .223 Rem (5.56x45mm)
Finish/Color Matte Black
Magazine Capacity 30 Rounds
Manufacturer Sig Sauer
Manufacturer Part # RM400-16B-TRD
Overall Weight 7 lbs (3.2 kg)


The M400 TREAD is an optics ready, aluminum frame rifle. TREAD features a 16” stainless steel barrel with a free-floating M-LOK handguard, a single-stage polished/hard-coat trigger, ambidextrous controls, a Magpul™ SL-K 6 position telescoping stock, a mid-length gas system, and is available in 5.56 NATO.

The TREAD branded accessories include:

- M-LOK handguard with lightening cuts to reduce weight, available in 13” and 15” lengths;

- 3 chamber compensator;

- Ambidextrous charging handle made of aircraft grade aluminum and a dual roll pin design;

- ROMEO5 optic featuring a 2MOA dot with ten illumination settings, MOTAC, and 50k battery life;

- Flip-up front and rear iron sights that are easy to install, adjustable, and deploy quickly;

- M-LOK front sight adapter with co-witness height made of lightweight aluminum;

- Multiple configurations of M-LOK grip kits made of high strength polymer;

- Factory upgraded flat blade, single stage trigger.


Mag Type


Barrel Length

16 in (406 mm)


5.56 NATO


7.5 in (191 mm)

Overall Length

30.8 in [782 mm]

Overall Width

2.5 in [64 mm]

Twist Rate



7 lbs (3.2 kg)

Operating System

Direct Impingement


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