He only has two styles of locks, late English and early German but there are no better out there, everything CNC machined for a perfect fit and function. Kibler
Chambers is next in line for locks, lots of styles. Of course there is Davis and L&R but not near the quality of a Chambers. M&G get pretty good reviews plus there is one guy starting to build locks comparable to Kibler but doesn't have them on the market yet.
Barrels, Rice is the most popular, nice barrels. Green Mountain makes really good barrels but only straight, none swamped. If Green Mountain made swamped barrels i would buy theirs over a Rice, they use regular gun barrel steel instead of the leaded steel all the others use.
Colerain is OK, they come with a fitted breech plug that may or may not be breeched properly, a Rice breechplug is always fitted perfectly, Green Mountain don't come with a plug.
You are going to get sticker shock when you look into parts costs now.