What do you think?

http://www.brownells.com/rifle-parts...prod77791.aspx

$84.99

SPECS: Fits AR15. Carriers are machined from 8620 steel and properly heat treated. Bolts are machined from 9310 steel, are shot peened and magnetic particle inspected.

Kits include: AR15, gas key, gas key screws (2), stripped bolt, extractor, extractor spring w/ insert, extractor pin, ejector, ejector spring, ejector pin, bolt gas rings (3), firing pin retaining pin, firing pin and cam pin.

I'm asking because the price seems good and I like to put things together.