I just picked one up for a dedicated 3 Gun rifle for my youngest brother. 2 real comments.
#1 I have other AIM BCG's and consider them a great value for the money and quality. I assembled a rifle for a friend who had a strict budget, so we used an AIM standard BCG. The accuracy for the gun has been very acceptable, and performance has been at the same or higher standard that I expect of an even higher priced product.
#2 You will really enjoy the benefit of a lightweight carrier for your 3-Gun rifle. In case no one else jumps in, or has brought this up to you I had a couple of things with this. Make sure that you use an adjustable gas block to take advantage of the weight savings. Also, I noticed a bit of a difference when switching the JP low mass buffer in my JP15. I have a friend that has JP's full lightweight BCG in his 16in, carbon length gas rifle with a non-adjustable gas block, and A2 birdcage. I think the low-mass carrier in this case was a waste. You could shoot his rifle and have no idea that he had a bolt carrier like that in there. It feels like every other carbine/rifle. My JP15 is flat as shit with the low-mass components, adjustable gas block and compensator. I really believe its all the components together that make a great flat shooting gun. My .02. Hope your new carrier works out well!