Lyman® Ammo Checker™ “GO” Gauge Block 223 Rem, 6.5 Grendel, 6.8 Rem SPC, 7.62×39, 300 AAC Blackout, 450 Bushmaster, 458 SOCOM, 50 Beowulf


Lyman MSR Ammo Checkers are machined from solid blocks of 6061 T6 aircraft grade aluminum and cut with custom tooling to minimum chamber dimensions. Their black anodized finish matches your favorite “black” rifle. Check the quality and consistency of both loaded rounds and purchased ammo. A must for any MSR shooter. You can’t afford mis-feeds, so get the easiest “Go” gauge available for modern sporting rifle calibers.


  • Covers 223/5.56, 6.5 Grendel, 6.8 Rem. SPC, 7.62×39, 300AAC Blackout, 450 Bushmaster, 458 SOCOM and 50 Beowulf
  • CNC machined to minimum chamber specs
  • Confirm ammo will chamber smoothly

Additional Information:

Manufacturer SKU 7833003


Manufacturers, importers, suppliers, and distributors may make changes to their products without fanfare. Such changes can lead to discrepancies between the advertised product and the actual product in inventory. While International Shooting Supplies Ltd. endeavors to correctly describe the actual product in inventory, we will not be responsible for unintentional inaccuracies in text and images of the advertised product.


Lyman Products


223 Remington, 300 Blackout, 450 Bushmaster, 458 SOCOM, 5.56 Nato, 50 Beowulf, 6.5 Grendel, 6.8 SPC, 7.62×39

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