I suspect you can get that complete upper direct from Centurion - or at least it was possible at some point to have them build it there. With or without BCG works.
The CH/BCG is gorilla proof from there on the top half.
The lower can be done pretty easily with a GOOD punch set, lube, electrical tape, a good castle nut wrench, patience, and YouTube.
The only part of building an AR that is particularly tool, skill, and later risk intensive is properly installing the barrel onto the upper with the handguard/nut of choice. This is the only part I've seen people screw up at home if they're not trying just smashing at things - and for the pieces required to do it right (torque wrench, vise, block, etc.) for less than two or three rifles it's cheaper to have that done elsewhere - fortunately places that sell complete barreled uppers are already extremely good at this.
Last edited by TehLlama; 08-06-13 at 23:56.
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