Gass relief hole botom of breech block.

HisSoldier · 11-01-2019, 01:22 AM

While searching info on fluted firing pins here I learned that it was not done to prevent damage from pierced primers, but I did find a mention of Finnish P-08's that had a relief hole under the breech block, likely from the front of the cylindrical bore for the firing pin, for that very reason.

I don't know if it's statistically a likely event but it sure sounds like it would be a costly one if it damaged the rear of the retaining lock area.

I'm an old machinist by trade and am wondering two things, 1. What is the Rockwell hardness of the breech block in that area? 2. How large is the hole and does it enter perpendicular into the bore where I mentioned, where the radius blends with the bore?
I have four candidates for this mod and if there is no downside to it I may want to add the hole to all of them. None of my Lugers, though all in near new condition, are "collectable", two '70's Mausers and two 1920 Commercials.

I hope this isn't the dumbest question in the forum's history!

11-01-2019, 01:22 AM	#1
HisSoldier User Join Date: Aug 2007 Location: Oregon Coast Posts: 95 Thanks: 1 Thanked 14 Times in 10 Posts	Gass relief hole botom of breech block. While searching info on fluted firing pins here I learned that it was not done to prevent damage from pierced primers, but I did find a mention of Finnish P-08's that had a relief hole under the breech block, likely from the front of the cylindrical bore for the firing pin, for that very reason. I don't know if it's statistically a likely event but it sure sounds like it would be a costly one if it damaged the rear of the retaining lock area. I'm an old machinist by trade and am wondering two things, 1. What is the Rockwell hardness of the breech block in that area? 2. How large is the hole and does it enter perpendicular into the bore where I mentioned, where the radius blends with the bore? I have four candidates for this mod and if there is no downside to it I may want to add the hole to all of them. None of my Lugers, though all in near new condition, are "collectable", two '70's Mausers and two 1920 Commercials. I hope this isn't the dumbest question in the forum's history! __________________ The fear of the Lord is the beginning of wisdom Last edited by HisSoldier; 11-01-2019 at 10:28 PM.