PSA Hammer-Forged Mid-length SQR Premium 16'' Stripped Railed Upper - Without BCG or Charging Handle
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http://palmettostatearmory.com/index.php/catalog/product/view/id/11916/s/psa-hammer-forged-mid-length-sqr-premium-16-stripped-railed-upper-without-bcg-or-charging-handle/