"Match", what does that mean? Barrels, ammo, etc. Is it used as an incentive to push a certain product, marketing ploy?
With the AR crowd, "Milspec" is used in place or along with this word.
Unfortunately, "match" in this context is a meaningless word used to sell gun editions and gun parts. Kinda like the way the word "tactical" has come to be used. Doesn't mean a thing.
It DOESN'T mean that the part or gun in question is up to certain specs or used in the National Matches, though that's what the sellers hope that you'll draw a mental association with, and buy accordingly.
Buy from reputable, well known manufacturers and vendors and you'll grnerally get good quality.