Sinclair - Comparator Insert Barrel Off The front length adjustment is

The front length adjustment is performed by means of a two-pronged buckle

Will fit all bolts in normal use today

High-speed ZeroStop adjustments to return to absolute zero

590 between 1850 and below

5-21×44 FFP - DPRC-1 3

Sinclair - Comparator Insert Barrel Off The front length adjustment isThe Sinclair Bullet Comparator inserts are meant to be used with the Sinclair Bullet Comparator and Bump Gage Body. These inserts are stainless steel and machined with a taper and a short straight section to more accurately duplicate the chamber throat. This eliminates the wobble experienced with many comparators which have standard drilled holes. Our design allows you to quickly and accurately measure and compare bullet ogive to base as well as