[DWCoyote]

I have used Spike's and Aero Precision. Both did what they were supposed to do. The Spikes had a slightly nicer finish. Both lowers fits pretty snug with an aero precision upper and with Del-Ton's uppers (only ones I have tried). It was kind of nice as the rattly sloppiness of my Colt was kind of a turn-off.

I am actually AR - free right now but the last AR purchase I made was a Spikes lower from AIM Surplus for $80. I bought it for my wife and filled the spider in with pink paint. She has bad shoulders so I am going to build her a lightweight. The recoil doesn't bother her but holding up the weight does.