Yes, I took off the base plate and removed the spring before cutting. I am using the original 10-rd spring and it seems to load like the regular 14-rd mag. The 10-rd spring is slightly narrower than the 14-rd spring to better fit between the internal ridges but they are both the exact same length.
Beretta Px4 .40 SW; Remington 870 12-ga; Saiga .223; .22LR Rifle
"If we wish to encourage a society where citizens come to the aid of neighbors in distress, we must not strip them of the actual power to do something about crime." ~ Murray Rothbard, For a New Liberty