I have a RRA 16'' r4 barrell mounted in a colt upper.  It has a new RRA bolt assembly in it also.  I am wanting to take the barrel off and remove the bolt, then install it into a new RRA flat top upper.  I got this colt this way but now I want to put the colt back original and assemble a RRA.  I will purchase the new upper, delta ring assembly and charging handle.  FYI a friend assembled it and I bought the gun to help him out.  It is in excellant condition.  I am new at this build it yourself thing but I have done some reading, here mostly,(which probably just makes me more dangerous).  

Question? Can I just dissassemble the parts and reassemble them the way I want them without checking headspace.  I am getting different answers and do not know what to do.

Thanks in advance.

Headspace (HS) is the relationship between a given barrel (chamber datum point) and a given boltface. If the HS is good with your current configuration on the Colt upper receiver then you should be OK with changing the barrel and the bolt assembly to a new upper. For peace of mind I always recommend checking HS for safety reasons. Charles the Gunsmith.  

Thanks, do you know where i can purchase headspace guages? and are they easy to use?

Thanks again

Bushmaster has them in their catalog and on the website.

You can purchase the HS gauges from Brownells.com. You need a GO and a NOGO. Some people, not I, also believe you need a FIELD. Other people believe you need only a FIELD.

It probably would be cheaper to find a gunsmith/armorer to check the HS for you. Screen the gunsmith/armorer with the question 'do you work on AR's?'. If negative response keep looking.

I could do it for you but you would have to pay round trip shipping. I would do it for no fee as it really only takes me a few minutes.

Good luck. Charles.  

Thanks for the offer.  I will try and find one here in georgia but if i can't i may take you up on it.

Thanks