I've got a 3 lug I'd like to install on a PCC I have, but I don't have a 3 lug wrench. Any tips/tricks to installing without one? I've read using the suppressor to tighten is somewhat common? Not sure how bad of an idea it is? I will be using Rockset also. Thoughts?

you can try to use a combination of pliers and a wrench. Place the pliers on the lug and use the wrench to tighten it. Make sure to tighten it evenly and don’t over tighten, as this can damage the adapter or the barrel.

My advice would be to buy a 3 lug tool instead. They are relatively inexpensive and only require a torque wrench or a socket wrench. Here's one for only $6

Link

A 19mm open end wrench might grip it, but not very positively. One wrench flat goes on a lobe and the other wrench  flat contacts the inside corners of the other two lobes. Knipex smooth jaw, parallel pliers probably would work even better.

One of the Griffin tools has a 3-lug cut-out. Liberty Suppressors also used to have a torque wrench adapter. Torque was pretty low.  

Any tool that increase grip over bare hands plus install with low strength threadlocker is probably adequate.

Buy the tool at that price. Cheaper than f****ing up the 3 lug.