The weight the UBR stock is adding negates any advantage gained in shifting the CG aft. The UBR is 1.5 lbs, not counting the RE. The CTR weighs .5 lbs. But just how much does the UBR shift the CG? In reality, not much.
CG with CTR stock fully extended-
CG with UBR stock fully open-
The UBR changes the CG by only about an inch and a half but the carbine is now a
full pound heavier.
My carbine feels livelier with the lighter CTR stock although it's CG is closer to the muzzle. When the UBR is installed, the carbine feels dead in comparison. I don't think your issue is one of balance. I think it's the extra weight of the UBR
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