i can only relate to trad ml flintlocks, and in that vein ...
cva and tradition ml's are fine for what they are - decent trad ml's that get you into the game for Cheap. maybe less than 1% of their users will ever have a need to attempt to pull these rifle patent breech plugs, and 99% of them will either booger up or destroy the barrel in the process. but for the few buck$ spent on 'em, who cares? the cheapest long term trad ml that WILL allow patent breech plug removal is still those built not in spain, but in italy by investarms - the best value in a production trad ml these dayze, imho.