Rock River Arms BT-9 9mm 4.5″ Pistol, M-LOK Handguard

About this product

The Rock River Arms BT-9 is an AR-style 9mm pistol built around a 4.5″ chrome-moly barrel and a free-float M-LOK handguard. It features an A2 flash hider, flip-up iron sights, a Glock-style magwell, and a pistol buffer tube for a compact, carbine-like handling profile. The design accepts Glock-compatible magazines and is intended for range use, close-quarters applications, and general-purpose shooting where a compact AR platform in 9mm is preferred.

Key Specifications

• The caliber is 9mm.
• The barrel measures 4.5 inches.
• The barrel material is chrome-moly steel.
• The handguard is a M-LOK compatible free-float design.
• The muzzle device is an A2 flash hider.
• The platform is an AR-style 9mm pistol.
• The design accepts Glock-compatible magazines.
• The pistol is equipped with flip-up iron sights.
• The firearm uses a pistol buffer tube configuration.
• The listed weight is 14.65 (unit not specified in source data).

Purpose-built for shooters who want a compact AR-style 9mm platform, the BT-9 combines a short, chrome-moly barrel and an M-LOK free-float handguard with Glock magazine compatibility to deliver a familiar, modular setup for range work and close-range applications. Its straightforward feature set—flip-up sights, A2 flash hider, and a pistol buffer tube—keeps the platform practical and adaptable for owners who value rugged, no-nonsense gear.

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