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It should fit just fine. I don’t have the 19 variant, but my 17 fits my 34 holster just fine. If you have an “open” holster it should still fit without any issues. I have used it with my normal CC/EDC holsters as well as my OWB range holster for my 17 with no issues. It’s honestly going to come down to preference or willingness to buy a new holster.
The attachment method is different and it is slightly different porting. I don’t have the A6 in the 19 length, but my 17 fits in a 34 holster and if you have an “open” holster it should still fit fine with no issues. I have used mine with my regular EDC holsters as well as my OWB range holsters for my 17 with no issues.
No- this is 9mm barrel if that’s what you are asking.
It has a single large port at the end of the barrel that the ports on the comp line up with which then get further redirected.
The radian’s porting is slightly different but accomplishes the same thing.
Yes it is because it doesn’t require a threaded barrel and is attached using a “proprietary” mounting system so it is “50 states legal”