Product Overview
- AR-format pistol chambered in 5.56 NATO with an 11.5" cold hammer forged barrel and 30+1 capacity.
- SIG 2-Stage Matchlite Duo trigger and ambidextrous safety for consistent, accessible control.
- Ships with a Magpul BSL pistol stabilizing brace; muzzle threaded at 1/2"-28 tpi.
- Must ship to a Federal Firearms License (FFL) holder.
Overview
The Sig Sauer M400 SDI X in 5.56 NATO is an AR-format pistol built on black anodized aluminum alloy receivers with an 11.5" cold hammer forged steel barrel running a carbine-length direct impingement gas system. It ships with a Magpul BSL pistol stabilizing brace, a SIG 2-Stage Matchlite Duo trigger, and an optics-ready flat-top receiver. The muzzle features a 1/2"-28 tpi tapered shoulder for aftermarket muzzle devices or suppressors.
Key Features
- 11.5" cold hammer forged steel barrel with carbine-length direct impingement gas system.
- 1:7 twist rate supports a wide range of 5.56 NATO projectile weights.
- SIG 2-Stage Matchlite Duo trigger with a defined take-up and distinct break.
- 1/2"-28 tpi tapered-shoulder muzzle threading for suppressor or muzzle device installation.
- Magpul BSL pistol stabilizing brace included for single-arm support.
- Ambidextrous safety selector for right- or left-handed operation.
- Optics-ready flat-top receiver with M-LOK handguard for accessory attachment.
FFL & Compliance
This firearm must be shipped to a Federal Firearms License (FFL) holder. The buyer is responsible for knowing and complying with all applicable local, state, and federal laws prior to purchase. Magnum Ballistics does not provide legal advice or determine purchaser eligibility. We ship only to the FFL dealer selected during checkout.
