Selected counterbore size is compatible with standard M16 extractor types and magnum bolt faces.
Please Select Pilot Size:
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Items that are in stock will ship within 7 days. If not in stock, this item is custom made to order.
A Piloted Counterbore is a quick and accurate way to cut the recess for the bolt nose when rebarreling. The Counterbore saves time and gets better results compared to using a boring bar to form the recess. Removable pilot ensures concentricity of the bolt-nose recess with the bore.
Straight Counterbores allow the bolt-nose recess to be cut to any depth, but it is up to the operator to control depth of cut. Stepped Counterbores limit the depth of cut to one repeatable dimension, and as such they are suitable for production runs with minimal operator effort.
Counterbores ship with one standard removable pilot. Be sure to specify Pilot Size when ordering.
NOTE: All PTG Reamers and Cutting Tools are designed to work with petroleum-based lubricant. Water-based lubricant can give acceptable results, however the life of the tool will be reduced. For best results use petroleum-based lubricant.