Quoted:
What is the cheek (chin?) weld like with the ACOG that much higher up?
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It's actually excellent.
Just a short slide up from the irons (which are always available but never in the 4X sight picture), comfortable, plus the "heads up" cheek weld lends itself very well to the BAC concept with superb peripheral vison. Your close in holdover is a little more as it's 3.5" height over bore as compared to 2.5" for a flat top mount. But, BAC works better and faster for me with this rifle than any of my flat tops.
The short eye relief is what makes it all work so well, plus, the TA31 ACOG was designed originally for the carry handle mount in mind, and has the BDC calibrated to 55 grain ammo out of a 20". Out of this little 14.5" HBAR, you are roughly 2.5" low at 300 yards progressing to 9" low at 500 yards depending on your ammo so the reticle is still quite useful.
At the range, everyone that shoots Q3131A through this little rifle is amazed at how easy it is to hit targets rapidly whether standing, sitting or prone with the 30 rounder as a monopod. It's fast, comfortable, easy and in a word, LOUD!
I cut my teeth on a A2 many years ago like many of us older guys and hated scopes on them unless you had that cheek piece on the stock but then you didn't have irons (unacceptable).
The first time I picked up an A2 with an ACOG on it I said "where have you been all my life".