Our NEW - NDZ Performance Muzzle Wear (MW or ME) Bore Erosion Gauge Tool for Garand, Carbines and 1903 Rifles or most .30 bores - Stainless Steel.  Our lasering process does not influence the diameter unlike other tools which can reduce your reading up to .001" showing a better bore than it actually might be.  An original barrel showing .300" or .301 reading will bring much more value to a collector thus increasing the firearm collectability.  Generally speaking, the muzzle will wear far greater than the throat.

  • Brand NEW - works with most .30 Cal Bores
  • Easy to use – the (00) is .3000"  Tool measure bores from .2990 to .3025  (.303" is a general wear or service limit on a barrel)
  • Line increments every .0005" inch - high quality, everything you would come to expect from NDZ
  • Fits .30 Caliber Rifle Barrels
  • Measures Muzzle Wear for Erosion the M1 Garand,  & M1 Carbine and others
  • Made proudly in the USA by skilled craftsmen
  • Lifetime Warranty against Breaking or Failure
  • Laser engraved markings (does not add to diameter) - Easy to read!



  • 0.0 indicates a .300 diameter bore, that is, .30 caliber, new, perfect
  • 0.5 is like new, .3005 caliber. Proper re-crowning will perfect the crown
  • 1.0 is excellent for a used barrel (.301 cal.) Re-crowning should make it like new
  • 1.5 is good (.3015 cal.). Proper re-crowning should make it excellen
  • 2.0 is fair (.302 cal.). Proper re-crowning should make it serviceable
  • 2.5 is poor (.3025 cal.). Proper re-crowning might make it serviceable
  • 3.0 or more. Replace barrel
Trust the NDZ Brand, we have a solid reputation within the Pro 2A community with great parts and accessories and customer service at 1000+ reviews 4.9+ on G00GLE !!




NDZ Performance offers fast handling time; ships same to next business day with tracking provided!!

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