Limbsaver is now selling pre-fit recoil pads for the Magpul carbine stocks that should fit both the CTR and MOE adjustable stocks. The recoil pads use the same NAVCOM material the company uses in their other recoil pads.
MSRP is $41.99, but looking around the internet I saw prices of $30-35 for the item. Limbsaver claims recoil reduction of up to 70% through a process of dampening and redirecting the recoil.