Not sure how the whole tariff situation has been affecting prices etc, so if you want to stick with non-US products (and mostly Canadian) these are some of the more popular choices out there:
1. Barrel- IBI, KS Arms (both offering pre-fit options that are excellent). I’ve shot both and they are great. These 2 are in Western Canada, if you’re out East I’m sure there are other barrel manufacturers out there that are great as well.
2. Action - KS Arms (has a nice 3 lug), Ultimatum Deadline (this is through IBI as well), Cadex, Zermatt arms. Defiance Machine are often seen as a top-tier action but will get pretty pricey. The idea of an interchangeable bolt head is getting more and more popular - gives you the flexibility to swap out calibers a little easier down the road (though most PRS stuff uses a 308 bolt face).
3. Chassis - A large number of rifles on the line are using MDT. But there’s also Masterpiece Arms (MPA), Foundation Stocks (both US Companies) that are pretty popular. MDT is probably the least expensive(?) and can be pretty easy to sell used down the road if you want to try out something different.
4. Trigger - Triggertech, Bix n Andy.
5. Muzzle Brake - Spearhead Machine, Insite Arms.
I didn’t really list bottom of the barrel stuff - but these are brands that I’ve tried and have all worked great. You didn’t mention price but I’ll break it down too.
1. Barrel - $900-$1100 for a prefit + about $150 for a gunsmith to install. Blanks are usually $500-700 plus $500-800 for gunsmith work (varies by smith).
2. Action - good ones start at around $1200-$1300. IMO anything at this price and above is usually great.
3. Chassis - could probably get a used one for $900 or less?
4. Trigger - A few hundred
5. Muzzle Brake - $150-$300