Sorry, but the pricing I get from Kieslers is confidential.
But let's put it this way, if you are a regular and steady customer they will take VERY, make that EXTREMELY good care of you.
However, if you only buy one gun every year or two or only to show up and complain that their shelf prices are higher than those at the gun show, or are always trying to get them to come down on their prices or throw something in for "free," then don't expect much off MSRP or shelf price.
Their prices can vary a lot depending on what kind of customer you are and I can tell you this, they have done things for me that I never would have expected them to do and have given me prices I never would have dreamed about asking for. Treat them right and they will treat you right back in spades.
Of all the things I miss about southern Indiana, Kiesler's is the one thing I miss most.
Grip modification? The only thing I did to the grip was to cut a small piece out of the side of the Hogue grip. On two other ARs that I have Hogue grips on, the selector lever has rubbed against the grip making it spongy feeling. Just like the other two, this one was rubbing so I had to cut a small amount of grip out to clear the control lever. If this is the mod you are referring to, then thanks, if not, then I am not sure what you mean.