It is confirmed the OTP handguard for AR15s. I've bought two different models from this listing.
Based on everything I've gathered from Q's website, this is made for most AR platforms. The handguard admittedly looks very much like the Q Fix/Mini Fix handguard (I have one so), but I believe this specific handguard has been designed around AR15 platforms. The Q Fix handguard has a screw that mounts in the direction of the lower receiver (toward the trigger and magwell) whereas this one has one screw that secures the hanguard from right to left or left to right, if that makes sense.
I had the same question so I did some research. I was confused because Qs website showed it with a top picatinny and I couldn't find that same handguard anywhere else. I'm pretty sure this one works with any milspec AR upper but there is a picatinny rail you buy separately as an accessory and attach yourself.