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So I'm considering building an AR bit by bit over the next few months. Start with stripped lower and add to it as time & money allow. Want a precision target build, either in .223/5.56 or perhaps in 6.8mm or some other "new and improved" caliber. Will save the complete upper until last, giving time to mull over caliber decision. The lower, I know what I want and don't want to "waste" money on unneeded parts (thus no complete lower parts "kit". I have estimated some costs below, But am stumped on some of the parts (what I need, and prices) like buffer tube stuff, mag catch, bolt release, selector switch, pins, and other little parts that would normally come in a generic kit.

Does anyone have some good estimates for the $??? stuff below?

AR-15 target build budget

$600 ~  Bull barrel upper complete
$125 stripped lower
$150 Timney trigger (or other light target trigger)
$250 Magpul PRS stock 
$??? buffer tube, spring etc  
$??? Remaining lower receiver parts
$45 Magpul grip
$150 backup front & rear iron sights