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I was having trouble with the magazine forward ,top steel edge catching on my CM9 magazine opening on the forward edge of the plastic handle grip. I couldn't find any reference of how fix the problem on the forum so I added a slight chamfer along the forward interfering edge of the opening. Problem has gone away. I was getting ready for next set of classes and I know they practice quick magazine change. I thought maybe someone might have a pro-con comment?
Bob
Bob