Our custom made 5/16" solid carbide end mill bit is optimized for high speed precision milling of 80% lower receivers with a handheld router. The upper portion of the end milling bit is reduced to 1/4" to fit standard routers, while the shank and cutting surface are 5/16" diameter to allow for easier milling with minimal deflection. This product is also proudly made in USA.
NOTE: This is the only 5/16" high speed end mill that will work properly with Easy Jig Gen 2. Using another type or size may cause damage to your lower and jig, voiding the warranty.
Removing material too quickly can result in a poor surface finish or a broken end mill. For best finish results, and long tool life, set the router to its maximum speed and take your time by moving slowly and making shallow passes.