I picked up a 120mm grip from Extreme Shooters to replace the 126mm on my Tactical 4.0. Everything was good until I put the main spring into the new shorter mainspring housing. Now the hammer is almost impossible to pull back. Is there supposed to be a shorter main spring for a shorter grip? I ended up cutting a couple of coils off the spring and it didn’t help. If anything I’ll probably pick up a Wolff aftermarket spring and try it.