Not my proudest moment in terms of the way it's posted, but I have a page on my site on my
BCM carbine.
Now, if buying today....
Daniel Defense lower, complete, with MOE grip & stock $379
BCM upper with plastic handguards, BCM BCG & Charging handle $626
That gets you into a complete, functional firearm for $1k, add another $60 for either a
DD fixed rear sight or a
Magpul rear MBUS if you prefer folding.
Agree with the above posters re: the
Aimpoint C3 in mount @ $465.
You're now at $1100 for the rifle with rear BUIS plus $465 with the optic for a total of $1600 give or take for the complete package.
Magpul Pmag 10-pack should run you <$150/shipped bringing you to $1750, and a decent sling like the BFG Victory gets you to around $1800 total.
Herein lies your problem. Getting ammo, 1,000 rounds of it, for $200. Even if shooting Wolf that's not going to happen.
One possible solution is to buy something along the lines of a
Spike's Tactical complete lower for $275. That is nearly $100 less than the DD above, and frankly I am of the opinion that the lower these days is one of the least critical elements. The standard M4 stock is MORE than serviceable, the Spike's comes with a milspec extension so you can change it out later if you want, and the only think it needs is a MOE grip and a gapper (the A2 grip has to go, every time) and Spike's probably has those available for a slight upcharge if you call them.
Going that route would get you another $100 or so for ammo, meaning a total of $300, and it looks like
AIM has a version of PMC for $310 plus shipping. (caution, I have not used this ammo myself although I am planning on ordering a case to try out this week).
So my suggestion would be:
$300 Spike's lower ($275 plus shipping and transfer, may be a little over $300)
$626 Complete BCM upper
$465 Aimpoint C3 in ADM mount
$150 for 10 Pmags
$50 for BFG Victory sling
$60 BUIS
$350 ammo shipped
$2001 total package
All of the items in blue are available from G&R which may net you a slight reduction in price for the total package but should at least mean that you can get the whole package assembled for free when it arrives to you, saving you some hassle. Handguards installed, optic mounted, BUIS mounted, BCG and CH installed.