Brownells Brownells Brownells 75th Anniversary - A Shooting Heritage

Bubble level attaches to the muzzle crown tohelp you calibrate a Flatline Ops ADI, ACI, orother brand angle indicator. When the bubbleis between the lines, the barrel is absolutely level, so you know theindicator’s reading will be accurate.


Sinclair, Issue:4B, Page:211

FLATLINE OPS, INC. - FLATLINE OPS TRUE BORE ADI/ACI SET-UP TOOL