FS: Sig 5:16 piston upper

[JustinDS]

I have a Sig Sauer 5:16 patrol piston upper with after market bird cage compensator. I've put 150 rounds through it and just don't shoot any more. willing to sell for 760 Obo Paypal or face to face in San Diego County. Email direct at artifactrocker@gmail.com for fastest response. Willing to ship