@dK6
dk6,
I recently purchased a OCR off the shelf. I put a Geissele two stage in it, a magpul free floating 4 rail grip and that's all! OK, I threw a Trijicon Accupoint on it (never buy an ACOG, the Accupoint is the same except cheaper and with adjustable zoom!)
Just took her out to our range and shot 3, 10 round groups at .35 inches (about 5 mins between sets to cool the barrel). Wow! This is a stock rifle except for the mentioned changes!! It eats everything, everytime. I am a meticulous cleaner, but this rifle is a breeze. I can't believe how impressed I am with a $1000 purchase straight off the store shelf.
So now I have built a perfectly competent battle rifle that looks more like a little uzi. It's absolutely perfect for SHTF situations to absolutely destroying coyotes!! So much fun. It's truly a great rifle. (It's sooo nice to be pleasantly surprised for once.)