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Discussion Starter · #1 ·
Below are the dimensions I have copied from actual US GI gages. Some of these dimension may have changed slightly over time as changes may have been made to cartridges, primers, and bolts.


  • M1 & M14............ Min. .044...............Max. .060
  • M16 ......................Min. .028...............Max. .036
  • M60 ......................Min. .035...............Max. .043
  • .30 BMG...............Min. .060...............Max. .068
  • .50 BMG M2........ Min. .073 ..............Max. .080
  • M203 G/L............ Min. .032 ..............Max. .047
 

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Thanks for the information Bill. I am still curious as to how the M14 safety bridge plays into the firing pin protrusion dimension, at the starting point (rotation) of bolt lockup. More specifically, what the acceptable measurement range is. Have those numbers been discussed within that subject?
 

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Discussion Starter · #3 · (Edited)
A firing pin protrusion gage measures the firing pin point with the front face of the bolt. In other words is the firing pin protruding enough to set off the primer (Min) or too much to pierce the primer (more than Max). No other measurements are related to this gage.
 
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