Break Action Inserts and Poly Choke Question (How to modify my Backpacker 12g)

CBMS

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Location
Victoria
I am looking for Shotgun inserts for my 2.75" 12g.
I want to get a sleave for it to go down to to 20g, 410, .22lr and also to 45-70.
Anyone have any hints on where to find such devices?
Also I would prefer if they could work with the ejectors on my Model 37 Win.

New edit now that I think of things (always at the wee hours of the morning too, eh?).

I want to put a Poly-Choke onto my Backpacker Win 37. A couple of questions here.
A.) What bbl wall thickness SHOULD I have to place in a set of Rem choke threading (I plan on getting A Remington 870 later on and will use the chokes as interchangeable parts).
B.) Does the Poly Choke count towards OAL of bbl?

Thanks All!
 
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