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Magazine Catch Issues

Colt style 9mm magazines have a very small engagement area relative to 5.56mm magazines.

The magazine catch is independent from the adapter. Occassionaly there is a problem with the magazine catch not going deep enough to engage the magazine. Usually this is due to a magazine catch machined too shallow, the pocket for the magazine catch can be machined improperly as well. 

Rock River Arms makes magazine catch that goes deeper.

9mm Magazine Catch - 9MM0099