Dunno if it's been posted, but buy the lower and upper from the same mfg, so it's way more likely they'll line up with no wobble.
If ya buy em in person, put em together and check fit.
Good thought
Aero lowers also have nylon tipped screws to be able to take out any slop between lower and upper. For the money I really like the m4E1 lowers with the integral trigger guard.
So do the current Stag lowers.
Stag has blem FDE lowers in stock for 65 bucks.
