I'm interested in some 20 gauge shotgun adapters for my NEF 20ga single shot shotgun.

Thinking of purchasing from here, http://shotgunadapter.com/
And getting the adapters in .45ACP & .22LR as those are the calibers I have in stock.

Anyone have these adapters and use them? What's your thoughts on them? I realize they won't be good for distance but short range is all that is needed. It would be used as a just in case type feature.

I'm also considering ones from, http://www.gunadapters.com/categorie...ters/20-gauge/
In .22LR or even .410/.45Colt.

Pros/Cons of the adapter?