I recently built up an SPR mk12mod0/A2-Scout using the following parts:

Colt A2 upper from RBP
Colt 1/7 rifle HBAR from numrich(p/n TD197300) w/ A1 flash hider
PRI Gen III rifle forearm system from Dave at pri
PRI clamp on folding front sight/gas block from Steve at Adco
RRA bolt carrier assembly and charging handle from RBP
YHM bipod and sling rail adapters from RBP
Aluminum "door knocker" buttplate from RBP
A1 usgi buttstock(od krylon)
DPMS service rifle sling
RRA scope mount from RBP
Burris 2.75X Scout scope

I just could NOT bring myself to tear down my old Colt flat top varmint rifle for this SPR build.  So to test out the barrel first and get some trigger time on it, I mounted everything on a Colt A2 upper.
I'm a strong advocate of the Springfield Armory Scout rifle in 7.62 Nato as the ideal "general purpose rifle" platform(IMO), and have been quite comfortable with the forward mounted optics involved.  With a five round magazine, it is the perfect truck gun/hunting tool, and with a few 20 rounders filled with fangible west german ball you can really get someones attention a quarter mile away!
Rather than buy a new scope to test how well the concept would translate into Arfese, I grabbed the Burris off my SA Scout, rationalizing that she and I needed a few "naked rifle" range dates to get better aquainted anyway...

The arf Scout Practical Rifle points well.  Shoots well.  Functions well.  NO batteries required...  Any other "outside the box" thinkers here?

Paladin

ps, Krista at RBP is great, I ordered parts on Fri afternoon, and they came in Monday's mail!
http://home1.gte.net/res07evx/sitebuildercontent/sitebuilderpictures/110-1053_img.jpg

Nice gun.  Love to bust the paradigms!