obdocab said:
Can you get an aftermarket barrel, and can you remove existing barrel from an existing gun?
There aren't really any manufacturers for "JUST barrels" Pac-lite makes one that has the receiver built in. If you WERE able to buy JUST the barrel, it would probably be expensive. AND due to the fact that it would require a gunsmith to thread or remill the existing receiver for a new barrel, unless you know someone personally, it would be cheaper to buy a threaded upper. (SEE PAC-LITE)There are several aftermarket manufacturers who produce these.
Once you have your threaded upper, simply remove your existing upper and install the threaded upper on your metal lower. This may require minor fitting but in most cases I'm not aware of any fitting that was needed. get a good rubber mallet for seating the upper to the lower.
Then your ready to reasemble your pistol and install your supressor.
Its really no big deal, and in most cases if you can field strip a MK1/2/or3, its just that easy.
Let me know how your project turns out.
http://www.tacticalsol.com/tshome/tactical-solutions-pac-lite-barrel-upgrade-for-the-ruger-2245-and-mk-series-pistols