Yes the "Accubrake" is included Corey. It has 28" #2 contour free-floated blackened stainless steel, fluted barrel with Accubrake. (SUB-MOA Guarantee from Weatherby).

Yes this model comes with the Accubrake. Specifications and Features: Weatherby Mark V Ultra Lightweight MUTM300WR8B --- Bolt Action Rifle --- .300 Weatherby Magnum --- 28" Barrel Blackened stainless steel fluted barrel with recessed target crown --- 1:10" Twist Rate --- Right Hand Bolt Action --- 3 Rounds --- Mark V Components --- Factory Tuned Full Adjustable Trigger --- Free Floated Blackened Stainless Steel barrel with Recessed Target Crown --- CNC Machined 6061 T6 Aluminum bedding plate --- Pachmayr Decelerator Recoil Pad --- Sling Swivel Studs --- Synthetic Stock Monte Carlo Stock with Matte Gel Coat Finish and Spiderweb accents --- Length of Pull 13.625" --- Drop at Comb 1" --- Drop at Heel 1.5" -- Monte Carlo 0.375" --- Overall Weight 6.75 lbs --- Overall Length 48.625"

Hi Corey, Yes this model comes with the Accubrake. Specifications and Features:
Weatherby Mark V Ultra Lightweight MUTM300WR8B ---
Bolt Action Rifle ---
.300 Weatherby Magnum ---
28" Barrel Blackened stainless steel fluted barrel with recessed target crown ---
1:10" Twist Rate ---
Right Hand Bolt Action ---
3 Rounds ---
Mark V Components ---
Factory Tuned Full Adjustable Trigger ---
Free Floated Blackened Stainless Steel barrel with Recessed Target Crown ---
CNC Machined 6061 T6 Aluminum bedding plate ---
Pachmayr Decelerator Recoil Pad ---
Sling Swivel Studs ---
Synthetic Stock Monte Carlo Stock with Matte Gel Coat Finish and Spiderweb accents ---
Length of Pull 13.625" ---
Drop at Comb 1" ---
Drop at Heel 1.5" --
Monte Carlo 0.375" ---
Overall Weight 6.75 lbs ---
Overall Length 48.625"

Corey, Yes this model MUTM300WR8B- UPC 747115428304 does come with the Accubrake. Works great. They say reduces recoil by 35%. I would say it cuts it in half. Big difference.