These look like a really nice lower for what you pay. I've used their same version in AR10, and for the price it's hard to beat the features. It eliminates the slop between the upper and lower which always bothers me. It also has a nicer way to install the bolt catch which is great if you ever want to replace it with something else. I'm ordering one
New Forged Lower with lots of Bang for the Buck Aero Precision AR-15 M4E1
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Nice, Frontier Gear! FYI, I actually scored the Aero Precision Upper + Lower combo for only $89 (yes, both together). This unit still has the threaded hole for the takedown pin detent/spring, and it has the set screw in the grip for tightening up with the upper. This doesn't have the integrated trigger guard, though.
Here's where I got mine:
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Here's another aero option, which I recently bought: builders kit with lower, enhanced upper and handguard for $210 http://schuylerarmsco.com/winter-sal...-upper-9931325
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