Product Overview
- Semi-automatic AR-15 platform rifle chambered in 5.56 NATO with factory-mounted Romeo5 Gen II red dot and Foxtrot-MSR light.
- Chrome moly threaded barrel (1/2x28) with hybrid flash hider/compensator; 2-stage Matchlite Duo flat blade trigger and ambidextrous safety.
- Includes Romeo5 Gen II red dot, Foxtrot-MSR light, vertical foregrip, three M-LOK rail covers, and one 30-round polymer magazine per manufacturer copy.
- Must ship to a Federal Firearms License (FFL) holder.
Overview
The Sig Sauer M400 SDI Sentry in 5.56 NATO is a semi-automatic AR-15 rifle with a 16" chrome moly threaded barrel, 30+1 capacity, and a direct impingement mid-length gas system. Receivers carry a black anodized finish and the rifle weighs 8 lbs with an overall length of 36.5". A Romeo5 Gen II red dot and Foxtrot-MSR full-size weapon light are factory installed.
The M400 SDI Sentry also includes a vertical foregrip on the free-floating handguard, a Magpul MOE-SL 6-position telescoping stock, and a 2-stage Matchlite Duo flat blade trigger. The Romeo5 Gen II offers a 2 MOA dot, IPX7 waterproofing, and MOTAC motion-activated illumination with an estimated 40,000-hour runtime.
Key Features
- 16" chrome moly threaded barrel (1/2x28), 1:7" twist, 5.56 NATO, 30+1 capacity; 36.5" OAL, 8 lbs.
- Black anodized receivers with direct impingement mid-length gas system.
- 2-stage Matchlite Duo flat blade trigger; ambidextrous safety selector.
- Hybrid flash hider/compensator at muzzle reduces muzzle rise.
- Romeo5 Gen II red dot: 2 MOA dot, MOTAC illumination, IPX7 waterproof, estimated 40,000-hour runtime.
- Foxtrot-MSR full-size light: 1,250 lumens and 33,000 candela output.
- Magpul MOE-SL 6-position telescoping stock; vertical foregrip on free-floating handguard.
What's In The Box
- Sig Sauer M400 SDI Sentry rifle
- Romeo5 Gen II red dot sight
- Foxtrot-MSR full-size weapon light
- Vertical foregrip
- Three M-LOK rail covers
- One 30-round polymer magazine
FFL & Compliance
This firearm must ship to a Federal Firearms License (FFL) holder. The buyer is responsible for knowing and complying with all applicable local, state, and federal laws. Magnum Ballistics does not provide legal advice or determine purchase eligibility. We ship only to the FFL dealer selected during checkout.
