PRR Vent 3 and 6mm

TL;DR: PTR doesn't recommend it, but you can probably get away with it without a problem if you alignment is good. Bore clearance seems to be about 7mm or so (a 6.5 alignment rod passes clean through it with space to give, and a 30cal rod fits through the tip). It has more space than the Ekron, which turned out fine.

My Vent 3 has been sitting around kind of not doing anything so I'll give this a whirl.