Daniel Defense DDM4 300s Carbine

Posted: 04/08/2026

Daniel Defense DDM4 300s Carbine

The Daniel Defense DDM4 300S is a high-performance, short-barreled rifle (SBR) or upper receiver group specifically designed for the .300 Blackout cartridge, optimized for suppressed shooting, home defense, and tactical applications. It features a 10.3-inch barrel with a Strength-to-Weight (S2W) profile, designed to offer superior ballistics over 7.62x39mm and greater muzzle energy than comparable 5.56mm platforms. No magazines are included with this gun.

Specifications:

  • Caliber: .300 Blackout
  • Barrel Length: 10.3″
  • Barrel Profile: S2W® (Strength-to-Weight)
  • Twist Rate: 1:8″
  • Gas System: Pistol Length (Direct Impingement)
  • Weight: 5.77 lbs
  • Overall Length: 26 3/4″ – 29 7/8″
  • Muzzle Thread: 5/8×24 TPI
  • Handguard: DDM4 Rail 9.0 (Picatinny)