A little barrel work for a PR

[MD*GSP]

Originally Posted by Mike Franzen

Sounds like you have your work cut out for you. Where does one find those shims?

Yes, it’s a bit of work but it’ll be worth it. The intended gun feels unbelievably dynamic to me. My primary concern and, the reason I’m being extremely conservative in my approach is due to the irreversible work that is required to fit the barrels, as noted. The 16ga barrels, while not rare, are not that easy to come by. A set that has not been serialized is even more uncommon to find.

This barrel set fits two other 20ga’s I own, as is. Therefore, the decision to use the gun for the upcoming season before modification is a no-brainer considering I was able to achieve proper fit with a shim.

Here’s an order page full of shim stock from Manhattan Supply Co (MSC)

[Metal Shim Stock | MSCDirect.com](https://www.mscdirect.com/browse/tn/...vid=4287924361)

And here’s an order page from McMaster Carr

[McMaster-Carr](https://www.mcmaster.com/#shim-stock/=190imvs)

I prefer McMaster Carr but both outfits ship quickly.

If you page through the catalog pages from either supplier you’ll likely find small packages of shims with varying thickness instead of large-sized rolls of a single thickness that is tantamount to a lifetime supply.