AA AR15 Piston Rifle Kit. $450 plus shipping.

[arakboss]

16″ DIY P-Series Kit - Adams Arms

Jazz up your next build with our newest P-Series DIY kit. Only item missing is your lower, build it up burn it down. With our Patented Retro-fit Piston System, you can keep your maintenance to a minimum. Less maintenance=more range therapy Upper Receiver: A4 Flat-Top, Forged Barrel Length: 16"...

adamsarms.net

Shipping to me was listed at around $15.

Add a $35 lower and you have a Piston AR15 for sub $500.

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[TTSX]

Pretty attractive price. I just got a PWS piston upper for $600. Don't know about quality but it's worth looking at