here is the link at TRI-STAR tristararms.com/products/home-defense/krx-tactical/Beretta/benelli mobli choke tube see *****General Description: 3” gas operated, box-fed, with true AR-Style controls. Removable choke system *******uses Beretta®/Benelli® Mobile Threads, includes extended tactical choke. Highly durable injection molded stock and forearm; full-length picatinni rail, removable carrying handle and bridge front sight. Rubber Recoil pad, swivel studs, two (5rd) magazines included and backed by a five-year warranty. Features: • Box-Fed 12ga • Full-length Picatinni Rail along top • Removable Bridge Front Fiber Optic Sight • 5 Round Magazine (Two included) • Chrome-lined Chamber and Barrel • Swivel Studs • Tactical Style Choke Tube Action: Gas operated Semi-automatic. Bolt remains open after last round is fired. If magazine and chamber are both loaded, opening action will result in ejecting shell from chamber and cycling new shell from magazine into the chamber Safety: The primary safety is located on the backside of the trigger guard. When engaged, the safety is designed to block the trigger, hammer lever and the hammer which makes the firing mechanism immobile. Magazine: Removable Box-fed bottom loading.

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Hi James, It has a Removable choke system. It takes Beretta/Benelli Mobile chokes, it does include a extended tactical choke.

here is the link at TRI-STAR tristararms.com/products/home-defense/krx-tactical/Beretta/benelli mobli choke tube see *****General Description: 3” gas operated, box-fed, with true AR-Style controls. Removable choke system *******uses Beretta®/Benelli® Mobile Threads, includes extended tactical choke. Highly durable injection molded stock and forearm; full-length picatinni rail, removable carrying handle and bridge front sight. Rubber Recoil pad, swivel studs, two (5rd) magazines included and backed by a five-year warranty. Features: • Box-Fed 12ga • Full-length Picatinni Rail along top • Removable Bridge Front Fiber Optic Sight • 5 Round Magazine (Two included) • Chrome-lined Chamber and Barrel • Swivel Studs • Tactical Style Choke Tube Action: Gas operated Semi-automatic. Bolt remains open after last round is fired. If magazine and chamber are both loaded, opening action will result in ejecting shell from chamber and cycling new shell from magazine into the chamber Safety: The primary safety is located on the backside of the trigger guard. When engaged, the safety is designed to block the trigger, hammer lever and the hammer which makes the firing mechanism immobile. Magazine: Removable Box-fed bottom loading.

here again James we find different stuff from gallery of guns Multi choke (Cyl Extended Tactical Included) UPC:
713780251257
Description:
TRI KRX TACT 12M/20MC BLK SYN
Brand:
TriStar
Model:
KRX Tactical
Type:
Shotgun: Semi-Auto
Caliber:
12 Gauge
Finish:
Matte Blue
Action:
Semi-Automatic
Stock:
Black Synthetic
Sight:
FT: Fixed RR: Adjustable
Barrel Length:
20
Overall Length:
38
Weight:
7.4 lbs
Capacity:
5+1
Safety:
Cross Bolt Safety
Receiver:
Matte Blue
Chamber:
3
Chokes:
Multi (Cyl Extended Tactical Included)
Butt Plate:
Black Rubber
Features:
Full Length Top Rail, 2 Magazines,;
Carry Handle, Removable Front Sight

This shotgun has a "Fixed Cylinder Bore". ((Specifications and Features)): - Tristar 25125 - 12 gauge - Semi automatic - 20" ported barrel - 3" chamber - 5 rounds capacity - Fixed cylinder bore - Lightweight polymer stock - Picatinny top and accessory rails - Overall length 38" - Weight 7 lbs 6 oz - Black.

Beretta/benelli mobli choke tube see *****General Description: 3” gas operated, box-fed, with true AR-Style controls. Removable choke system *******uses Beretta®/Benelli® Mobile Threads, includes extended tactical choke. Highly durable injection molded stock and forearm; full-length picatinni rail, removable carrying handle and bridge front sight. Rubber Recoil pad, swivel studs, two (5rd) magazines included and backed by a five-year warranty.

Features:
• Box-Fed 12ga
• Full-length Picatinni Rail along top
• Removable Bridge Front Fiber Optic Sight
• 5 Round Magazine (Two included)
• Chrome-lined Chamber and Barrel
• Swivel Studs
• Tactical Style Choke Tube

Action: Gas operated Semi-automatic. Bolt remains open after last round is fired. If magazine and chamber are both loaded, opening action will result in ejecting shell from chamber and cycling new shell from magazine into the chamber

Safety: The primary safety is located on the backside of the trigger guard. When engaged, the safety is designed to block the trigger, hammer lever and the hammer which makes the firing mechanism immobile.

Magazine: Removable Box-fed bottom loading.