]GWACS CAV-15 MKII Polymer Lower Receiver they have 9 as of right now. If you realy realy need a lower, here it is.
http://www.marksarmory.com/GWACS_CAV_15_MKII_Polymer_Lower_Receiver_p/gwacsblk.htm
http://www.marksarmory.com/GWACS_CAV_15_MKII_Polymer_Lower_Receiver_p/gwacsblk.htm
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