These are mandatory tools for those who are serious about shooting accuracy and precision. Takes all of the guess work out of of barrel issues and figuring out what the correct / optimal projectile diameters are. They eliminate "blind" bore lapping polishing as you can see and measure the precision bore diameters to hit polishing tolerances.
17" Hawkeye / Gradient Lens ProSlim (0.165") borescope
Paid $2K from Gradient Lens, I can do $899 shipped CONUS (Zelle) or PP with fees.
Mitutoyo Digital Micrometer (342-361-30)
These mikes are spot on to the 10 thousandths of an inch. I have a precision Mitutoyo gauge block that I can include for an extra $25 to base calibrate.




HD precision optics90-degree attachmentAdjustable Supernova LED
Mitutoyo Digital Micrometer (342-361-30)
These mikes are spot on to the 10 thousandths of an inch. I have a precision Mitutoyo gauge block that I can include for an extra $25 to base calibrate.
- NIST calibration certificate
- 30° Anvil tips (AWESOME for measuring bore and groove diameters)
- Resolution: 0.00005" (0.001 mm)
- Accuracy ±0.0001"




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