Accu Choke ID

If there are no thin notches, then no; take a choke tube wrench and unscrew it - it will laser etched on the sidewall of the choke. Personally, one of the reasons I like extended chokes is because it is easy to tell what is on the barrel.

Yep, the main reason I buy extended chokes is for the same reason as George P and because they protect the crown of the barrel.

tws3b2, if the shotgun and barrels are OEM NIB from Mossberg there’s about a 99% chance the choke in the 28” barrel is modified.

In addition if you want to purchase another choke, the Accu-Choke system interchanges with Invector chokes, not Invector Plus but regular Invector.

tws3b2 said:

Only two notches. I assume for the wrench.

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Yes.

If you are talking specifically about the 28” field barrel absolutely do not ever shoot it with any type of shell without a choke tube installed.

Someone else will chime in but if I remember correctly it’s okay to shoot slugs through a modified choked barrel.

Use the short barrel for slugs. It should be cylinder choked.

I’m assuming the 18.5” barrel is not rifled because I think their rifle barrels are longer. If the barrel is smooth, don’t use sabot slugs. If it is rifled then use sabot slugs.

tws3b2 said:

Dumb question. Assuming it is modified, Could a slug be safely fired through it. Make that two dumb questions. If the choke was removed??

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NEVER shoot through that barrel without SOME choke tube in it. There are plenty of folks who make aftermarket chokes; Trulock and Carlson make good ones at reasonable prices. I prefer both Briley and Trulock the most. Wrenches are readily available. You DO need to remove the choke after shooting to clean the threads on both the tube and the barrel and then lube those threads with either some oil or grease.

Slugs of the Foster type can be safely fired through a M choke or more open. Most folks seems to get the best accuracy with something along the lines of an IC (Improved cylinder)

You can use a Quarter if you don't have a wrench. Look on ebay for chokes, sometimes you can find them at good prices. I use anti-seize on the threads of all my chokes