Board Thread:Off Topic/@comment-25396609-20160205001148/@comment-27592203-20160206064616

The problems I see with that are:

Are the caliber of the rounds the same?

How does the barrel telescope out? Won't the barrel diameter change somewhere?

Won't firing buckshots damage your rifled barrel?

Other than that, I got confused when you said "revolver like chamber", "small magazine" and "tube magazine", which magazine is for what?

Your idea could still work though, there are simple shotgun to rifle conversion kits like the X Caliber Adapter