I have to add something here. The receiver is not slamming into the frame. It is the rear portion of the breechblock that is cushioned under spring pressure from the striker retainer pin. The striker retainer is what is hitting this area of the frame and is the abutment.
Frame fins crack in time, especially a weapon almost a century old, although one might say under normal operation these fins sustain no wear? But we can speculate that it is fact that this area of the frame takes a tremendous pounding from the returning toggle, multiply that by 8 rounds over and over , over a period of years and than decades and the steel just gets brittle.
What happens is, the movement of the toggle, down on the frame through the years moves all the molecules in the steel to a head, just like in the striker, (Why dry firing lugers is not a good idea) and it just gets old and brittle and breaks off as the molecules all shove into the corner of a fatigued piece of steel. . As far as the breechblock cracking? It is not the breechblock that is hitting this area put the striker retainer, and this is under spring tension and absorbs impact. As we know. The weapon is just old. I have seen many Shooter grade Lugers with these fins long broken off.
There is like 1/16th of an inch of space were the receiver stops short of slamming into the frame. It is my opinion that factory spring, unless miserably weak, should not be changed. iF THE GUN WORKS , LEAVE IT ALONE
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