Zakaria, no the Choke is Fixed. The barrel isn't threaded for a choke tube.

Zakaria, The barrel must be threaded to accept a shotgun choke. This shotguns barrel does not have that feature. This shotgun has the standard cylinder choke.

its a fixed choke Panzer Arms – BP-12 Bullpup Semi-Auto Tactical Shotgun – Cal. 12 ga.
Barrel Length – 18 1/2″
Overall Length – 29 1/2″
Weight w/Empty Magazine – 9 lbs.
Self Adjusted Gas System
Upper Receiver – 7075 Aluminum including full integral picatinny rails
Lower impact resistant polymer w/Ergonomic Grip
Bolt – Chrome Moly
Recoil Pad
Adjustable Cheek Pad
Completely Ambidextrous – Safety Lever, Mag Release, Two Cocking Handles to Operate three ways, Up – Left – Right
Includes: 2 x 5 Rd. Magazines – Front & Rear Flip-Up Sights – Removable Angled Fore Grip – Cleaning Kit – Manual – Warranty
Magazines are interchangeable between Panzer Arms AR Twelve Shotgun as well as MKA 1919,
the BP-12 Bullpup promises to give you a satisfying experience with its innovative design and use of high quality materials, the BP-12 Bullpup setup reduces the overall length and weight substantially while not sacrificing barrel length and velocity. It is short, compact and easy top handle but still have the same accuracy as long barrel rifles, it serves lots of benefits in tactical settings, the design allows efficient use in close quarters.