I would take anything non-blowback over another 9mm AR variant, and would tell anyone who asked to save a few more pennies and do the same. Or buy the PTR for $1000 less and have money left over for "improvements" and ammo. Or a Zenith. Or an MKE. Or a Sig. I failed the "Fool me once, shame on you. Fool me twice, shame on me." test and have bought and sold two blowback 9mm ARs (RRA & Colt). For me, there is no comparison between blowback ARs and roller-locked, I think the blowback ARs suck due to the recoil characteristics.
https://www.atlanticfirearms.com/pro...-rifle-ptr-608