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Continue to ChatAssembling an AR Lower - Step 10 of 11: Installing the Upper Receiver Assembly https://blog.roninsgrips.com/assembling-ar-lower-step-10-11-installing-upper-receiver-assembly/
Assembling an AR Lower - Step 10 of 11: Installing the Upper Receiver Assembly https://blog.roninsgrips.com/assembling-ar-lower-step-10-11-installing-upper-receiver-assembly/