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ithacaartist · 02-13-2012, 02:06 PM

Update on conversion kit...
I'm reaching for the salt and pepper, preparing to eat a few previous words: The original ejector is indeed in the way if left in place. Though the relief slot on the bottom of the breech block rides at a level to clear the extractor, I finally noticed that it is not wide enough to accommodate the ejector without tickling its tip on the way past. The right rear lip of the mag comes up higher than the other side, which puts it right where it needs to be for its forward corner to take the place of the tip of the original extractor, as Gerben said. My installation of the mag confirmed that if the original extractor is left in place, the two interfere.
OK, now with the original extractor out of the way, there was still a drag in the action. Good lighting and magnification revealed that a couple of licks with a file to the top of the mag eliminated this slight contact. Indeed, the mag now clicks nicely into place, as this tiny extra dimension also kept it from doing this.
I'd already reproduced the adapting sleeve in a shorter version, a bit less than an inch in length, so the insert barrel is now adapted to the Mauser 29/70's six inch barrel. The plan is to salt blue the new part I've made, to match the rest.
With all assembled, I tried a few test mags of different stuff. The kit functions now at least as well as my Erma .22 pistols. The 5-shot mag's spring seems extremely wussy, but it worked most reliably on the last 3 rounds of each mag. I'll try a comprehensive ammunition test and see if the system has any preference in this realm. The left front lip on this mag is made of a piece of spring steel fastened to the top of the mag body. This provides a slight friction to the front of the round as it rises while being pushed by the returning breech block. My notion is that this setup provides a mechanicaly "calming" effect on the round during the first part of its travel to chamber, in contrast to the symmetrical steel lips of the plain .22 Erma mags, and the headlong free-flight trip to battery the round makes in the Erma pistols.

02-13-2012, 02:06 PM	#15
ithacaartist Twice a Lifer Lifetime Forum Patron Join Date: Mar 2011 Location: Atop the highest hill in Schuyler County NY Posts: 3,364 Thanks: 7,418 Thanked 2,599 Times in 1,375 Posts	Update on conversion kit... I'm reaching for the salt and pepper, preparing to eat a few previous words: The original ejector is indeed in the way if left in place. Though the relief slot on the bottom of the breech block rides at a level to clear the extractor, I finally noticed that it is not wide enough to accommodate the ejector without tickling its tip on the way past. The right rear lip of the mag comes up higher than the other side, which puts it right where it needs to be for its forward corner to take the place of the tip of the original extractor, as Gerben said. My installation of the mag confirmed that if the original extractor is left in place, the two interfere. OK, now with the original extractor out of the way, there was still a drag in the action. Good lighting and magnification revealed that a couple of licks with a file to the top of the mag eliminated this slight contact. Indeed, the mag now clicks nicely into place, as this tiny extra dimension also kept it from doing this. I'd already reproduced the adapting sleeve in a shorter version, a bit less than an inch in length, so the insert barrel is now adapted to the Mauser 29/70's six inch barrel. The plan is to salt blue the new part I've made, to match the rest. With all assembled, I tried a few test mags of different stuff. The kit functions now at least as well as my Erma .22 pistols. The 5-shot mag's spring seems extremely wussy, but it worked most reliably on the last 3 rounds of each mag. I'll try a comprehensive ammunition test and see if the system has any preference in this realm. The left front lip on this mag is made of a piece of spring steel fastened to the top of the mag body. This provides a slight friction to the front of the round as it rises while being pushed by the returning breech block. My notion is that this setup provides a mechanicaly "calming" effect on the round during the first part of its travel to chamber, in contrast to the symmetrical steel lips of the plain .22 Erma mags, and the headlong free-flight trip to battery the round makes in the Erma pistols.