DO NOT ATTEMPT TO USE PARTS THAT WERE NOT MADE FOR YOUR WEAPON!!!!!!!!!!!
Danger, danger, danger.
here are some slings. they are great price and quality http://www.cheaperthandirt.com/CategoryListing.aspx?catid=331
Mossberg made parts only.
You can purchase parts for a Ranger model 30 16 gauge shotgun at these locations. Gunbroker, Topgunsupply, Budsgunshop, Gunpartshop and Midwayusa.
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There are some sources for Crescent shotgun parts, but it is very possible that parts will have to be repaired/made.
I have parts for that model. sales@countrygunsmith.net
looking for stock model sb 20 gauge
Try e-gunparts.com
numrich gunparts.com has everything but the stock
You can find parts for many westernfield shotguns at Numrich gun parts. WWW.e-gunparts.com
Typical Crescent single-barrel shotgun. I have a good supply of parts. sales@countrygunsmith.net
I would start my search at Numrich Gun Parts Corp.