Sig Sauer M400 SDI X 5.56 NATO 16″ 30rd
Specs at a glance
About this product
The Sig Sauer M400 SDI X is a modern sporting rifle built for reliable performance in training, range work, and general-purpose use. It features fully ambidextrous controls, a mid-length direct impingement gas system, and a free-floating M-LOK handguard for modular accessory mounting. The platform ships with a Magpul MOE-SL style adjustable stock and a 30-round polymer magazine to support extended range sessions.
Key Specifications
- The caliber is .223 REM/5.56 NATO.
- The barrel measures 16 inches.
- The twist rate is 1:7.
- The muzzle threads use 1/2×28 pitch.
- The muzzle device is a SIG Flash Hider-Compensator.
- The action type is Semi-Auto.
- The operating system is Mid-Length Direct Impingement.
- The stock is a 6-position Magpul MOE-SL.
- The rifle ships with (1) 30rd polymer magazine.
- The weight with magazine installed is 7 lbs.
Engineered for shooters who value dependable, well-equipped rifles, the M400 SDI X combines ambidextrous ergonomics, a match-style two-stage trigger, and a rigid free-floating handguard to deliver a capable and adaptable platform for range use, training, and general-purpose shooting. Its accessory-ready layout and familiar controls make it straightforward to configure for a wide range of practical setups.
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Key attributes
| upc | 798681714469 |
| manufacturer | SIG SAUER |
| manufacturer part number | RM400-SDI-16B-FDE |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel length | 16'' |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 |
| color | Flat Dark Earth |
| length | 33.25'' |
| magazine included | 1 x 30-Round |
| model | M400 |
| number of magazines | 1 30 rd. Polymer Mag |
| package height | 4.0 |
| package width | 11.3 |
| product type | AR |
| safety | Lever Action |
| shipping weight | 9.7 |
| sights | No |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |