Hi,
The holdopen device is an L-shaped rod that is pushed upwards by the magazine follower button. It has a small leaf spring that enables it to be pushed down again.
A number of things can cause the holdopen function to work improperly, for example the type of ammunition used, the magazine, the holdopen itself, etc...
When firing normal military or police issue European 9mm rounds I find that the holdopen does not engage very often. With S&B 124 gr. it always does.
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