I just got my 1st bushmaster not to long ago, and was wanting to know is it better to have a chrome or polished blot then the stock black one???

Hard chrome is a better finish in many ways than phosphate coatings.  However hard chrome if not propperly heat treated can cause hydrogen embrittlement.  I have no reason to get a hard chromed bolt as there are better choices for coatings and platings.  Id select the phosphate for cost purposes.  You dont risk a bolt that will break at the cam pin hole and its the milspec finish.  In other words sometimes yes but usually no is the answer to your question.

Quoted: I just got my 1st bushmaster not to long ago, and was wanting to know is it better to have a chrome or polished blot then the stock black one???

Given that there is no corrosive primed .223 Rem or 5.56x45 ammo floating around, I don't really see a huge advantage to a chromed bolt over the standard one.  Just keep your rifle clean and well oiled, and I bet you wouldn't see a significant enough difference in longevity for chromed to justify the cost difference.

Get a chrome carrier if anything usually bout 50 bucks more...

I used to have a COLT chrome bolt... It was nice for easy cleaning... After shooting, to remove all the carbon build up, I would just buff it using my wire wheel on the Ole bench grinder... It would shine like new after a good cleaning... And then one day while buffing it, the thing slipped out of my hand and the force of the wire wheel tossed the thing across the room like a bullet... The bolt met a piece of iron on impact and cracked in two

Well that sucks!!! RIP crome bolt...