I would go with an Armalite upper and lower receiver, bolt group, etc. The stock is a personal thing - but personaly I don't care for the PRS or the SPR grip.
If you have money to burn, you might give George at GA Precision a call... He built a Mk11 clone that is pretty impressive, and I wouldn't doubt is better than factory. I'm not sure if he / they have a source, but the build used the real KAC Mk11 gas block and front sight - and those can be hard to come by. Also, They can provide an Obermeyer 5R 1 in 11 barrel for your build (not that there's anything wrong with Pac-Nor; have 'em, love 'em, but you did say "clone").
Sounds like you will have a really nice rifle when its all put together.
Hope this helps,
Clint
Clint Lynch
Sentinel Design LLC
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