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Firing Pin Protrusion Dimensions

6K views 3 replies 2 participants last post by  leadbug 
#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
 
#2 ·
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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