The Bushmaster XM-15 E2S is a semi-automatic rifle chambered in .450 Bushmaster with a 20-inch barrel. The .450 Bushmaster cartridge fires a .452-diameter bullet at moderate velocity, producing significant terminal performance on large game within typical hunting ranges. At 7.06 lbs and 40 inches overall, the rifle handles as a standard-length AR with a fixed A2 stock. 
 

Key Specifications 

• Model: XM-15 E2S 
• Manufacturer: Bushmaster 
• Caliber: .450 Bushmaster 
• Barrel Length: 20 inches 
• Capacity: 5+1 rounds 
• Weight: 7.06 lbs 
• Overall Length (OAL): 40 inches 
• Action Type: Semi-Auto 
• Trigger Type: DM2S 2 Stage 
• Safety Mechanism: Manual Thumb Safety 
• Stock Description: A2 Fixed 
• Muzzle Device: Muzzle Brake 
• Twist Rate: 1:24" 
   

Detailed Features 

 
The DM2S two-stage trigger has a defined take-up stage followed by a cleaner break, which helps shooters fire accurately without jerking the shot. The muzzle brake reduces perceived recoil from the .450 Bushmaster cartridge, which generates more felt recoil than standard 5.56 NATO. The 1:24" twist rate is matched to the heavier .452-diameter bullets typical in .450 Bushmaster loads. 
 
The optic-ready flat-top receiver accepts standard AR scope mounts and rings. The A2 fixed stock provides a consistent length of pull without moving parts. The 5+1 capacity reflects the larger case dimensions of the .450 Bushmaster cartridge, which reduces magazine capacity compared to 5.56 configurations.

The Bushmaster XM-15 E2S in .450 Bushmaster attracts hunters who specifically need a large-bore AR for deer, boar, or other sizable game, and the feedback reflects that focused use case.

Stopping power is the primary draw and consistent positive - owners report the .450 Bushmaster performs well on large game at hunting distances. The semi-auto action and reliable feeding get good marks, and the build quality is described as solid for field use. Accuracy is generally well-regarded out of the box, with most buyers achieving hunting-accuracy groups without extensive load development.

The modular AR platform is appreciated for customization potential - optics, grips, and other accessories attach without issues.

Weight at 7.06 lbs runs heavier than lightweight hunting rifles, which comes up for buyers who cover long distances. Recoil from the .450 Bushmaster is meaningfully more than 5.56 NATO - the muzzle brake helps but doesn't eliminate it, and less experienced shooters report an adjustment period. Ammunition availability is a real consideration - .450 Bushmaster is not as widely stocked as common centerfire hunting cartridges. Price comparisons against bolt-action .450 options come up occasionally.