BCG to Barrel question

[niner]

How would I properly match a bolt to a barrel? I know some places will do it if you buy both the BCG and barrel at the same time/place, but supposing I don't, how would I match them properly?

Is it possible, does it matter? Or does it really only matter for serious competition type guns?

Please forgive my ignorance, I am in the (long) process of building and have been looking at upper components at the moment.

Thanks.

[niner]

hrm either nobody knows or it must not matter too much.

[jester]

i don't know much about it, but i would buy a GO and NO GO gauge to make sure the headspace is correct if i bought them separately. better safe than sorry...

ETA: http://www.larrywillis.com/gonogo.html

[Mr.Goodtimes]

niner, matching the bolt doesent really matter. from what i understand, it might make about a 1/8moa or less difference on a match quality rifle. ive seen people with uppers that would shoot 1/2 or less MOA all day long and they didnt have matched bolts.