Wheeler Delta Series AR-15 Reciever Lapping Tool - Reviews
Wheeler Delta Series AR-15 Reciever Lapping Tool
Good Product05/18/2014
By David
This tool does it's job quite efficiently. It make assembling an AR upper easier and more successful (accuracy) buy allowing someone without access to a lathe to easily square the receiver allowing the barrel nut to secure evenly.

I would recommend this product.
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Increase accuracy be ensuring a perfect fit of the barrel and receiver on an AR-15.