Landon, yes, this Weatherby Rifle comes with the "AccuBrake" from the Factory.

yes it does Weatherby Mark V Ultra Light 300 Wby Mag 28" with Accubrake 3 Rounds Synthetic Stock The Weatherby Mark V Ultra Lightweight is designed to deliver a big bore cartridge in a lightweight package. Starting with the stock, the Mark V Ultra Lightweight comes with a hand laminated, raised comb Monte Carlo composite stock which features an aluminum bedding block. The stock also has a matte gel coat finish and spider-web accents. The new hand lapped blackened stainless steel fluted barrel with recessed target crown and finally a Pachmayr Decelerator recoil pad to tame the recoil. Pick up one of these fine works of art today.
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"