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7 members (Stanton Hillis, Lloyd3, Argo44, Karl Graebner, shrapnel, 1 invisible),
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Forums10
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Jun 14th, 2026
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
Although not called "Mono-block" at the time as I recall Henri Pieper first patented the process of using a solid steel breech piece with tubes inserted. His patent referenced barrels inserted from the breech & there was a step down at the end of the breech piece, which is often referred to as "Fretted Barrels". Most, if not all, of these Pieper guns, were marked, Diana. I seem to recall that some of the French Robust guns used this system.
I have a Pieper hemmer gun which has the tubes inserted from the front, without a step. On these barrels the tubes go about halfway through the chamber & re both threaded & soldered. The breech piece is steel & consists of the hinge hook, double underbites & a doll's head, all one piece. The tubes are twist. The seam is visible & is in fact marked, which has never bothered me in the slightest.
The Pieper system was patented in the US on Aug 23, 1881, under ptent #246195 so this system is anything but new. I do not know for certain but highly suspect that Beretta coined the term "Mono-Block"
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Jan 2002
Posts: 5,219 Likes: 89
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 5,219 Likes: 89 |
I had a Pieper that was done like that, telltale was the presence of rings around the chambers, inside and out.  
My problem lies in reconciling my gross habits with my net income.
- Errol Flynn
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
I failed to mention, my gun with the non-stepped barrels was marked, Modified Dianna.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Jan 2006
Posts: 10,034 Likes: 642
Sidelock
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Sidelock
Joined: Jan 2006
Posts: 10,034 Likes: 642 |
Thanks for that image Rob, which I added here http://www.picturetrail.com/sfx/album/view/24563589Send me a PM with your name if you'd like an attribution The original Diana tubes were inserted into the tapered hole through the breech piece from the rear & are full length 1882 Forest & Stream  Sears 1907 catalog Modified Diana "the barrels are screwed into the breech" from the front  Steel breech with "Washington" tubes 
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Joined: Feb 2017
Posts: 405 Likes: 160
Sidelock
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Sidelock
Joined: Feb 2017
Posts: 405 Likes: 160 |
Any drawbacks to sleeving Damascus vs steel?
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Joined: Jan 2002
Posts: 348 Likes: 22
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 348 Likes: 22 |
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Joined: Feb 2002
Posts: 14,641 Likes: 345
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 14,641 Likes: 345 |
My Parker DH #3 frame 12 gauge, sleeved with ten gauge 3 1/2" tubes by Frank Lefever and Son, probably in the sixties, is nearly invisibly sleeved, with rib inscription changed to "Lefever Steel" in a very well done Parker type script. Yup, there are good and bad sleeving jobs. I must have one of the best.
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