I have an 18 in Monster group buy Grendel barrel in an Aero upper with Aero Keymod handguard. Will come with a Monster bolt. The receiver and barrel were lapped during assembly. Has 50 rounds through it and shoots great. Only reason for selling is to help fund a mountain bolt gun. Looking for $375 shipped. Trying to get pics uploaded. In the meantime I can text them to you if you?ll pm me your number
18 in Grendel upper
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