Charlie98
Member
I think it may be due to the interaction between the metal trigger parts and the respective frame materials.
I think it's more the slide fitment on the very thin steel rails cast into the poly frame. On my CW45, for example, you can see the front of the slide assy push up when you start to pull the trigger. The slide and barrel are locked up tight, which is what matters... but there are some looser tolerances elsewhere.