I am looking at a BCG from Rainier. NiB and they have a regular one and a match grade. What is the difference and is it worth the extra money? Thanks!

Asked the same question here

Pure marketing.

There is NO National Match standard dictated by the United States military nor the Civilian Marksmanship Program.

The USAMU's standard is results-based -- if an M16/M4 doesn't shoot sub-MOA at 300 Meters it's rejected for National Match or USPSA competition.

Probably means that they used the tight end of the tolerance range.  Not sure it it matters or not.  You may want to see what parts other guys are using to shoot tiny groups.  Personally, I'd want a bolt hand-fitted to my barrel, not just held to tight tolerances.

Not to offend  the OP.. but this is how I look at most "match" grade things... If you have to ask, it probably won't be the limiting factor. At least that's how it is for most of us (including myself).

I try to aim for something in the mid range price.. something that gets good reviews... has a good rep.... has good service (Rainier seems excellent from posts here).

However, when it comes to reloading, "match" does mean a lot to me. I find the ammo means more than the hardware in most cases. Match bullets, good powder, and consistent loads make my range time way more fun then one particular BCG v. another.

Match grade means whatever the merchant/manufacturer wants it to mean.

For Rainier it comes down to tolerances. With the more respectable brands, Rainier included, "match" generally means tighter tolerances for the length of the barrel, and often hand lapping of the barrel is included in those inflated prices.  For those high-dollar brand this is all standard for their barrels, but for those that sell "levels" the extra attention to perfection is what you're buying.  

Now with that being said I will tell you I shoot their Select series and it is fantastic for the money ($200 less than the Ultramatch Rainier sells).  Comes with a 1 MOA guarantee, but I'm in the .75 range with handloads.  At a 600 yd effective range that's about 4.5" of variance, PLENTY good enough for me since I'm not actually shooting matches.

I haven't owned any Rainier products until this last build, but I purchased their ultra match 13.7" barrel. I'm a big fan. I don't know how the others shoot, but this barrel has yet to have 100 rounds through it and it's shooting sub moa with a non-magnified red dot.

Oh hell I just realized you said BCG... I see "match grade" and assumed you were talking barrels.  Match grade on a BCG means jack and s^&t, so feel free to pick one or both.  The BCG means almost nothing to accuracy, so don't waste any money just because it says that.