Single Action Push Off

I was looking at the State of Texas website for information on the concealed handgun instructor's course.  Under the "what to bring" section of the site it stated that any single action revolvers could not be "push off single action revolvers".  Right away I thought "What is push off?"  I did an Internet search on the phrase push off single action revolvers" and "single action push off" which resulted in quite a bit of information.  I think I was able to translate it to make sense to the layman, like me.  Hopefully it  will help you know what to look for in future purchases also. 

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