QUOTE (fasdfs @ Aug 28 2008, 11:57 AM)

My brother has an Olympic CAR-style AR and I have an S&W M&P-15. In terms of fit and finish, mine is much nicer. He put an accu-wedge in his and only had to shave off a tiny little bit. I left about 1mm of material on the bottom of an accu-wedge, and even shaved down the back substantially and it still wouldn't fit. When you let the bolt carrier drop on his, there is a distinctive bell-ringing sound, whereas with mine, it's just a smooth, solid snickt with no reverberation. He paid $750 for his, and I paid $825 for mine. I think the extra $75 is worth it, personally.
If your buddy is totally opposed to getting a flattop upper, he could do like my brother did, and get a quadrail front handguard and mount an Aimpoint (or other red dot, but it works extremely well with an Aimpoint CompML2) on the quadrail and be able to co-witness with the red dot and the irons.
If he doesn't want to mess with any of that, and just get a cheap carry handle mounted optic, I personally think he would be better sticking with irons. ARs have the best iron sights of any rifle I've shot, and from my experience, cheap optics aren't really worth messing with.
oh and on a side note...about the "ring" your brother gets from the bolt slamming home, my buddy's bushy were talking about here has that same "ring", and he dropped i think 800-850 on it.
im not saying its bad im just saying things like that are not always important.
but i do get what your saying in regards to quality and fitting.
oh and AMEN about the cheap optics thing, to me , if you got a gun that will shoot 1 moa and the bullet is meant for more than 500 yrds, spend no less than 250 on the glass for it.
i am a simple man when it comes to optics, plain cross hairs are fine by me. i don't need nor want a bullet drop compensator or a light up recticle. just give me a good solid, sturdy, reliable, accurate, piece of glass and let me and my talent take care of the rest.