I bought a total of 5 Aero Precision lowers from MPAs and the price was unbeatable. IMHO - AP makes way better lowers than Spikes. The fit is immaculate compared with Spikes. The Spikes I have all exhibit wobble. Peter also gets his inventory pretty quick. Just call and he'll tell you when he'll get it in. He'll also order any rifle/pistol for you as long as he can. FFL transfers are also the most reasonable around.
Anyway, I picked up a Glock 17 Gen4 too. Again, great price and of course Peter provides great service.
He's going to get most if not all my business.