I'm looking on yall's site and I notice that some glock ar9 lowers say specifically,"non lrbho" and some don't. Does this mean the ones with no mention have a lrbho? I've got a 9mm upper on the way from you guys and would like to get a lower with the bho.

general rule of thumb with PSA. If it doesnt say it, it usually doesnt come with/ have / be it.  If yours you ordered didnt say its a Last round bolt hold open, its not.

For the time being, none of the AR-9 lowers will have the LRBHO feature.

i believe you are better off without it....this is a good video explaining why most people had the same issues with their psa lrbho
video

Great link illustrating what the problem is.  After watching the video, I can't believe everyone struggled to come up with a simple solution, either with spring assistance, or easiest of all, just building a magazine catch with a thicker lip to extend lower and contact the mag sooner, thus being pushed up higher to activate the bolt catch.

(I'm fairly new to the platform, so apologies if my terminology isn't spot on.)