Description
The Real M400-SDI SENTRY is a premium, factory-built AR-15 rifle from Sig Sauer. It features a 16-inch cold hammer-forged barrel with a 1:7 twist rate, housed in a lightweight M-LOK handguard. The rifle is distinguished by its two-stage match-grade trigger, ambidextrous controls, and durable Nitride finish for enhanced corrosion resistance, offering a reliable and accurate platform right out of the box.
Key Features
- 16-inch cold hammer-forged 4150 chrome-moly steel barrel
- Two-stage match-grade flat-blade trigger for a clean, crisp break
- Full ambidextrous safety selector, magazine release, and bolt catch
- Free-float M-LOK handguard for accessory mounting and heat mitigation
- Nitride finish on barrel and bolt carrier group for maximum durability
Specifications
| Caliber / Type | 5.56 NATO / .223 Remington AR-15 Rifle |
|---|---|
| Material | 7075-T6 Aluminum Upper/Lower, 4150 Chrome-Moly Steel Barrel |
| Finish | Hardcoat Anodized, Nitride |
| Compatibility | Standard AR-15/M4 components and magazines |
| Weight | 6.7 lbs (unloaded) |
The M400-SDI’s cold hammer-forged barrel provides exceptional accuracy and longevity by work-hardening the steel. The 5.56 NATO chambering and carbine-length gas system ensure reliable cycling with a wide range of ammunition. This configuration, combined with the two-stage trigger, makes it a capable platform for duty, competition, and defensive applications where consistent performance is required.
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