I have had a dry fire mag for a Glock 21 for about three weeks.
No, it doesn't replicate the stock trigger. I had to adjust the trigger pre-take and use a heavier spring (proived) on the mag for it to feel closer to the Glock trigger. Funny thing is that my stock trigger breaks at around 5.5lbs but I had to use a heaver spring on the dry fire mag (so that it breaks at 6.5lbs ) for it to "feel" similar.
I find it useful for learning to control against sight wobble when pressing the trigger, and for practicing quick double-taps when drawing from concealment.
Indeed very very useful for training shooting after drawing from concealment.
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Life is simply an inter-temporal problem of constrained optimization.
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