This upgrading thing is fun, but it can also be a pain in the ass.
The flip to the side mount I ordered for my 3x magnifier was the wrong height - one was standard and one was tall - I picked the standard and it's just a bit too short to line up correctly. I think I should log on to that BB where the Lucid owner was chatting and tell him it would be nice if he could actually include some actual measurements in the specs on his website.
Another thing I've noticed is that the slots on the top rail of the handguard do not line up with the slots on the rail on top of the receiver (you'd think it would have occurred to somebody that those should line up, but apparently not), which means to use the 3x I'll have to mount the sight much farther forward than I wanted to. The only other option is to get a Vltor quad that has a continuous rail which runs back over the receiver. That would be perfect, but set me back another couple of hundred.
Or I could just return/sell the 3x, and stick with the 2x, which fits perfectly with zero hassle, and call it a day.
Decisions, decisions.
Also installed the Magpul BAD lever. That's pretty cool.