Very nice chuck! When I looked at the magpul grips it looked like they had adjustable backstrap and frontstrap inserts for the grip... how does that work? I like the Aimpoint too. I was thinking of doing something like that. It seems like alot of the Specwar guys use Aimpoints mounted pretty far forward.
The Magpul MIAD grip has slide on front and back straps. One of the fron strap optoins that comes with the "full kit" version has an integral trigger guard. Simply remove the stock trigger guard, install your grip with your chouce of backstrap (S, M, L) and then secure the front of the trigger guard to the lower receiver with a grub screw. Works great. Magpul also makes a separate aluminum trigger guard that installs just like the stock one.
Tango Down also makes a great grip as well.
I have the Aimpoint co-witnessed (matter of using a spacer on the mount). Works great but it's still 4 MOA dot. Great for plinking and practical competition but not long range accuracy. I see a Leupold CQB 1-4X in my future!
I really dig the KAC M5 RAS. The Marines picked this and I can see why. I don't see the advantages of the more expensive free float models short of true sniper weapons.
And lastly - one more plug for Doublestar/J&T Distributing. Great family run business and friendly Kentucky people. They are in the process of filling a number of Gov't and LEO contracts. They really stand by what they sell!
ARe you getting any of the new Magpul PMAGS?