With the short 4 7/8" length, and the height, given as 0.903", it is about small enough to use on a pistol.
Seems that most locks need a whole lot of work to actually be useable- Kibler's CNC'd locks and Larry Zorns' lock being the only exceptions I am aware of.
But all the others need a lot of filing and tuning to be used on a daily basis.
The locks mentioned in this thread is really no exception, and that is expected these days. I'd be more than willing to try one out, especially with the fast lock time and sparking ability noted above.