Yes. That is correct. I put a rifle buffer tube, rifle buffer and rifle buffer spring, inside a rifle stock. Without the A2 spacer and with the shorter screw that came with the stock.
I misunderstood your previous post; I thought you kept the stock spring & buffer but added a rifle tube...
Ben says the rifle spring & buffer have almost the same resistance as the carbine spring & buffer. If they all match then pour a bottle of Mobil One on it and break the ****er in.
If it still short strokes, go back to the stock setup.
If that short strokes too then you will have to deal with the gas port. Hopefully it never comes to that.