Completely lost and confused, any help wanted

I know that junos-jseries does not support prefix-specific feature on j2300, but junos-jsr does ( we are talking about minimum release 9.3)
However, j2300 does not support junos-jsr, only junos-jseries.
So, decided to buy a couple of SRXs, they do seem to be able to run both jseries and jsr, however the key word here is "seems" in other words I could not find explicit CLI reference to it ( searching disabilities, lack of practice, etc)
Can someone confirm whether SRX210 ( or any other SRX for the matter) support a) junos-jsr and b) prefix-specific feature ??
Many Thanks
Robert
Robert