Must dremmel or file new grip for this to fit panzer m4 - Panzer Arms M4 Tactical Adjustable Telescopic Stock Set

This package comes with a new grip. On the inside of the new grip, there is a section that is more narrow than the original grip. For the Panzer M4 trigger group to fit the new grip, you must dremmel or file a section inside of the new grip. It’s not difficult but it’s aggravating.