[Why are all the barrels so long?]

Where would be a good place to have a "clean" job done.

There are few gunsmiths up here I would trust to do a good job?

[Why are all the barrels so long?]

I am looking for a semi auto shotgun with an 18" barrel and adjustable choke. But has a regular vent rib, not a rifle sight.

 

I cant seem to find anything shorter than 21".

 

Is there a reason for this?

Anyone make aftermarket barrel?

 

My purpose is primarily tactical matches but I don't shoot slugs so a straight rib is nice for speed. The adjustable choke would allow for some woods hunting.

 

Anyone got suggestions?