Do you need to have a new barrel & bolt head spaced? 

Yes

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36 minutes ago, charleslee said:

Do you need to have a new barrel & bolt head spaced? 

Of course...as the cap said for  bolt and semi auto guns....

 

But you said bolt head. ....  do you mean an AR TYPE?

 

some will say you don' have to.....

 

 

 

https://www.brownells.com/guntech/checking-headspace-part-ii-the-ar-15/detail.htm?lid=17140

I was told by a very respected gunsmith that if you buy good quality components, probably not. But he does.

Yes it would be for an AR. Colt M4 specifically. 

I doubt that anyone on this forum has the ability to headspace an AR.

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Like others have said, if you are buying decent AR style parts you are usually good to go. I purchased a guage to check my AR's and they were all within spec and didn't have to do anything.

8 minutes ago, PK90 said:

I doubt that anyone on this forum has the ability to headspace an AR.

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Idk, I bet @Bully could walk me through it. 

How is it different from head spacing anything else?

Nothing YouTube and a set of gauges couldn't handle. 

Easier with the barrel off the rifle, but can be done with it on. 

 

Idk, I bet [mention=4086]Bully[/mention] could walk me through it. 
How is it different from head spacing anything else?

I don't know how to change the headspacing. I assume it involves shimming the barrel extension.

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6 minutes ago, PK90 said:

I don't know how to change the headspacing. I assume it involves shimming the barrel extension.

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It’s mostly a non issue i agree. But

14 minutes ago, PK90 said:

I don't know how to change the headspacing. I assume it involves shimming the barrel extension.

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I would assume try a different bolt.