Because AR9s are not all the same. The ramped BCG (or the hybrid that PSA sells) doesnt act like a normal AR trigger when it comes to trigger reset and with a 2 stage things are different.
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Anyone ever tried an ALG Defense trigger in these?
Yes. That is what many of us use. Great trigger. ALG and Geissele are the same company.
Will the Super Dynamic 3 Gun trigger work in my AR-V carbine ? I want speed but not sure if the AR-V will be able to push that type of cycling. Been also looking into the CMC PCC drop in trigger. I was gonna buy the SD3G trigger locally but my salesman told me in his opinion the primer strikes would be light. I’ve seen other Giessele triggers mentioned here but not the SD3G. Any opinions or first hand testimony is appreciated.
Welcome to the PSA community forums 
@Stxnatureboy
It should work. AR-9s have lots of issues with aftermarket triggers. PSA designed the AR-V to work with aftermarket triggers. I have a G trigger in mine.
I used the CMC 3.5# drop in trigger in mine and it’s fantastic, If I didn’t already have an ALG in my AR I would put one in it too
Thank you for actually answering the question!
i got 3.5 fixed competition from triggertech it failed to work on my arv9