doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Insert Barrels

Paradox,
I don't think the actions are tested,they have already been proofed and the makers of ELs know from experience which actions are suitable for which cartridge.However, there are two different lines of answers in this thread.One is for insert barrels(einstecklauf-EL)and the other is sleeved barrels.Zimmerman and Henneberger, as well as many others,can also do this work.Avaliable calibers are pretty much dependent on the particular action.Once the barrels are sleeved, they have to undergo full proof testing.
Mike

Paradox's statement that the insert screwed to adjust at the muzzle with captive extractor is "interesting". Yes, it is "interesting", and also 130 year old technology at the minimum.

It may be old but it's new to me. I am still honing my machining skills and learning the basics of gun making! The old stuff fascinates me. I hope my questions didn't come across as idiotic!

eightbore,
As far as I know, the full length, full caliber Einstecklaufs that adjust at the muzzle(V.V.V.)were developed by Hans Zimmermann in the late 1970s/early 80s and he started marketing them in 81-82.Since then, a couple other makers have come onto the market. Sleeving is likely more than a hundred years old, but it usually used soft solder, rather than threads.These barrels were adjusted(regulated)the tradional way.
Mike

"I don't think the actions are tested,they have already been proofed and the makers of ELs know from experience which actions are suitable for which cartridge.However, there are two different lines of answers in this thread.One is for insert barrels(einstecklauf-EL)and the other is sleeved barrels.Zimmerman and Henneberger, as well as many others,can also do this work.Avaliable calibers are pretty much dependent on the particular action.Once the barrels are sleeved, they have to undergo full proof testing."

First of all, I would like to thank everyone for their thoughtful and helpful answers!

Mike, I am leaning towards going with EL inserts. Is my understanding correct that ELs can be removed by unscrewing and the gun used again as a shotgun?

I am not awae if he produced any rifles my the method, but Henri Pieper definitely produced double shotguns in wihich the tubes were threaded into a steel one piece breech piece. These were "True Monoblock" breeches though Pieper did not call them that. I am not certain but highly suspect the Beretta firm coined the term Monoblock & perhaps even copyrighted it. The tubes on this Pieper system (Of which I have one) only go about half way through the breech piece & at least some of them were marked "Modified Diana" (As is mine). They are pictured & described in a 1911 "Alfa" catalog, but preceded that date by some years I believe.

Paradox,
The ELs are not threaded to the barrels, they are usually held in by a sliding block that does operate by a screw.They can be removed/reinstalled with out any damage, and the shotgun used as before.
Mike

Miller,

He did produce cape guns. I just don't remember if they were monobloc.



While monoblock may have appeared in English ad's, I have never seen it in French for Pieper.



I can confirm that Beretta used the term, in Italian, in their catalogs.



Pete