I thought I pretty much had my heart set on a BCM 11.5" upper (either the standard barrel or BFH), but now I'm considering the Sionics option as well. I plan to shoot this primarily un-suppressed (so I'm not looking at the Sionics barrel with the reduced gas port size), but am curious as to how the two might compare with a suppressor. Does the Sionics M-Lok V2 rail have built in QD sockets? The picture shows circular cut outs but the description doesn't say. I am a big fan of the BCM KMR handguard, which is why I'm maybe still leaning that way. I assume the overall weight of the two is about the same? Any input would be appreciated.