Product Overview
- Short-barreled rifle (SBR) chambered in .223 Remington / 5.56 NATO with an 11-inch cold hammer-forged barrel.
- SIG 2-Stage Flat Matchlite Duo trigger and ambidextrous safety; direct impingement operating system.
- Includes Magpul SL telescoping stock and hybrid flash hider/compensator; ships optics-ready.
- Must ship to a Federal Firearms License (FFL) holder.
Overview
The SIG SAUER M400 SDI SBR is a short-barreled rifle chambered in .223 Remington / 5.56 NATO, built on the AR-15/M400 platform with direct impingement operation. The 11-inch cold hammer-forged barrel is threaded 1/2-28 and fitted with a hybrid flash hider/compensator. The black anodized aluminum receiver pairs with a Magpul SL telescoping stock. Capacity is 30+1 rounds, and the rifle ships optics-ready with no iron sights installed.
Key Features
- 11-inch cold hammer-forged barrel — threaded 1/2-28; fitted with hybrid flash hider/compensator.
- SIG 2-Stage Flat Matchlite Duo trigger — a two-stage flat-faced trigger designed for consistent pull.
- Direct impingement operating system — standard AR-15/M400 platform gas operation.
- Ambidextrous safety selector — accessible from either side of the receiver.
- Black anodized aluminum upper and lower receivers — standard M400/AR-15 construction.
- Magpul SL telescoping stock — adjustable length-of-pull in a low-profile design.
- Optics-ready configuration — no sights included; accepts standard AR-compatible optic mounts.
FFL & Compliance
This short-barreled rifle is an NFA-regulated item and must ship to a Federal Firearms License (FFL) holder. Buyers are responsible for understanding and complying with all applicable local, state, and federal laws, including NFA transfer requirements. Magnum Ballistics does not provide legal advice or determine individual eligibility. We ship only to the FFL dealer selected during checkout.
