huggytree Posted November 14, 2019 Report Share Posted November 14, 2019 (edited) my stamp came today. I had test fired the gun 2x over the past 11 months. it ran fine. on my first test i left it as is. then i swapped out the hammer and main spring with wolf. i noticed a dramatic increase in RPM. I just dissembed the gun and found my firing pin is bent (it wasnt before). i am wonding by changing out the hammer spring and not the firing pin spring if i made a mistake? i did install the wolf firing pin spring and a titanium firing pin today. i put the original main spring back in too. Edited November 14, 2019 by huggytree Link to comment Share on other sites More sharing options...
StrangeRanger Posted November 14, 2019 Report Share Posted November 14, 2019 (edited) Assuming the innards of the bolt are clean, the only way the firing pin gets bent is if the bolt hits the back of the cartridge it is stripping from the magazine with enough speed that the inertia of the firing pin overcomes the FP spring force and projects through the FP hole. When I bought my gun the springs were over 50 years old and the hammer would frequently give a light strike, especially with some berdan primed Argentine ammo of which I had a stash but it never had the firing pin protrusion issue. When I put the Wolff kit in my gun I changed all the springs. It completely solved the light strike problem and the protrusion issue did not and has not popped up The hammer spring is irrelevant to the protrusion problem, the other parts are not. The Wolff or any fresh recoil spring adds more force and therefore creates more velocity at impact. It could be enough to allow the firing pin to overcome the spring. A fresh FP spring, Wolff or otherwise is good insurance. The titanium FP is probably the real cure. It has only 2/3 the mass of the steel pin so it can withstand a lot more bolt impact before it has enough momentum to overcome the spring pressure. Edited November 14, 2019 by StrangeRanger Link to comment Share on other sites More sharing options...
Black River Militaria CII Posted November 15, 2019 Report Share Posted November 15, 2019 Make sure the titanium firing pin is not too long so that it will pierce the primer. If it does the high velocity jet of very hot flame will eat the pin. Had that experience with titanium Bren firing pins. Link to comment Share on other sites More sharing options...
StrangeRanger Posted November 15, 2019 Report Share Posted November 15, 2019 (edited) Is the correct protrusion on a Reising FP the same as on a TSMG: .044-.050"? Edited November 15, 2019 by StrangeRanger Link to comment Share on other sites More sharing options...
huggytree Posted November 15, 2019 Author Report Share Posted November 15, 2019 how do i test the length of the pin? going to test fire it tomorrow with my tweaked keystone mags (had to bend feed lips very slightly to get proper angle). doing a extensive test this weekend to try to get 8 mags tuned another question--for the main spring,how do you know it needs replacing? comparing the old vs new wolff. the wolff isn't that much longer, but it sure speeds the gun up- possibly 150 rpm+ Link to comment Share on other sites More sharing options...
huggytree Posted November 17, 2019 Author Report Share Posted November 17, 2019 (edited) got out to shoot it today...ran 100% until the hammer spring broke...pieces jammed in the hammer...cleared it and kept going with what was left of the spring...then the titanium firing pin broke only a few mag issues that I worked out by the end of the shooting session. i replaced the firing pin again, filed it down per the other post about making an enertia firing pin...swapped both the hammer and firing pin springs back to factory... gun was much better than I remembered. I was able to hit anything at any distance on my range. I was doing burst onto a full size silhouette at 25 yards and would hear ting,ting,ting (I cant do that with my Thompson) on semi auto it was even better. my sights are off about 6-8" but I still never missed in semi Edited November 17, 2019 by huggytree Link to comment Share on other sites More sharing options...
dalbert Posted November 18, 2019 Report Share Posted November 18, 2019 gun was much better than I remembered. I was able to hit anything at any distance on my range. I was doing burst onto a full size silhouette at 25 yards and would hear ting,ting,ting (I cant do that with my Thompson) on semi auto it was even better. my sights are off about 6-8" but I still never missed in semi Since the Reising fires from a closed bolt, it is a very accurate submachine gun. David Albertdalbert@sturmgewehr.com Link to comment Share on other sites More sharing options...
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