Can I use a choke tube in this shotgun's barrel? Or would I have to get another barrel?

Matthew, no Sir. This model has a Fixed Cylinder Bore and is not threaded for choke tubes. Cheers and stay safe!

You could have a gunsmith machine the barrel for choke tubes... Back in the day, before changeable chokes, it was the only way to gain the interchangeable choke. Buying a barrel with barrels already machined would be comparable in cost in most shops..

Cylinder bore barrel. No choke tube.

sorry you would need a new barrel to use a choke tube this gun has a 18.5 inch barrel with a FIXED Cylinder bore choke

This shotgun does not have removable chokes. You'd need a different barrel for that

What would be the best option for a +1 extension and aftermarket forend? I really just want an extra shell and for the end of the tube to to be even with the barrel. Also, I am having trouble finding forends that would fit without having to remove the heat shield. Magpul is usually my go to, but their forend doesn't fit this model.

Matthew, the +1 tube extension is here : https://www.thecountryshed.com/02-04-10.html

Save the money for training! Why do you NEED the extension and the modified fore end? Have you done any tactical drills with your shotgun to see if you need these or only want them? Pull the plug in your shotgun magazine tube, load it up with 2 3/4 inch 00 buckshot and you will have enough firepower for any situation inside your home. Cosmetics are wasted on a functional tool. As far as the fore end, try out verticals/slant and even the strap type...I think you will find that the factory shape is the most ergonomic. Even the military shotguns have a standard slide. (I carried a Remington 870 for 21 years in the military).

there are no forends that I know of that will work mag ext here thecountryshed.com/02-04-10.html

How long is the action tube assembly? Is it 7-5/8" ?

Matthew, Mossberg changed the Action Slide Tube Assemblies to 6 3/4" in 1993 on all 500 pump models, Can replace with 7 3/4" Action Slide Tube Assemblies for between $50 to $100 depending what brand you buy.

Matthew, this will be a 6.75" action slide tube. Cheers and stay safe!

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Mossberg & Sons 500 12GA 18.5 bbl with Heat Shield 5+1 - Blue/Black, 18.5" Barrel, 5+1 Rounds, Synthetic, 3" Chamber, Black Synthetic Stock

Name: Mossberg & Sons 500 12GA 18.5 bbl with Heat Shield 5+1
Brand: Mossberg
SKU: 415012242
Availability: OutOfStock
Rating: 4.80 (6 reviews)

6 Reviews| 3 Questions & Answers

Model: 50409

Condition: Factory New

Bud's Item Number: 415012242

UPC: 015813504096

MFG: Mossberg

Questions & Answers (3) Reviews 4.8 out of 5

Mossberg & Sons 500 12GA 18.5 bbl with Heat Shield 5+1

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Brand: Mossberg
Model: Model 500
Type: Shotgun: Pump Action
Caliber: 12 Gauge
Finish: Blue
Action: Pump Action
Stock: Black Synthetic
Sight: Bead
Barrel Length: 18.5
Overall Length: 39.5
Weight: 6.75 lbs
Capacity: 5+1
Receiver: Blue, Drilled & Tapped
Chamber: 3
Butt Plate: Black Rubber
Features: Heatshield

Product Information

Metal Finish

Blue/Black

Action

Pump

Gauge

12 Gauge

Barrel Length

18.5

Overall Length

39.5"

Capacity