The Sig Sauer M400 SDI X SBR 5.56 11" M-LOK Tele Stock Black 30rd is a compact, semi-automatic short-barreled rifle built around Sig’s proven M400 direct-impingement platform. Its 11-inch barrel, aluminum M-LOK handguard, and optic-ready upper receiver create a nimble, modern AR-style rifle that stays controllable while maximizing performance from the 5.56 NATO cartridge.

This model features a 30+1 capacity with the included 30-round magazine, a fast 1-in-7 twist rate for stabilizing common 5.56 and .223 Rem loads, and an adjustable telescoping stock to fine-tune length of pull. The black anodized finish and aluminum frame keep weight down while maintaining durability for regular range sessions, training, or home protection roles. Backed by Sig Sauer’s reputation for engineering and reliability, the M400 SDI X SBR offers a refined, ready-to-configure AR platform.

Key Features:

• Manufacturer: Sig Sauer
• Model: M400 SDI X SBR
• Caliber: .223 Rem | 5.56 NATO
• Condition: New
• Action: Semi-Automatic
• Barrel Length: 11"
• Number of Magazines: 1
• Capacity: 30 + 1
• What's In The Box: Rifle, 30-Round Magazine
• Weight: 5.8 Lbs
• Length: 28.2" - 30.1"