Gomann Berlin

[sheepherder]

Originally Posted by Schupo

These are complicated little things and a lot of trouble to use.

George, I find that a curious comment...I have fired three different .22 Luger sub-caliber conversions in the past Summer and didn't find them much trouble to use...

Ed's 4-piece 4mm conversion doesn't seem all that complicated either...(Although I would prefer the 4mm muzzle clamp that uses the interrupted rear nut)...

Could you explain further???

[kurusu]

Originally Posted by sheepherder

George, I find that a curious comment...I have fired three different .22 Luger sub-caliber conversions in the past Summer and didn't find them much trouble to use...

Ed's 4-piece 4mm conversion doesn't seem all that complicated either...(Although I would prefer the 4mm muzzle clamp that uses the interrupted rear nut)...

Could you explain further???

Maybe because the 4mm M20 (the one on the left) as no rim and might get stuck after fire.

4mmM20.jpg

[sheepherder]

Originally Posted by kurusu

Maybe because the 4mm M20 (the one on the left) as no rim and might get stuck after fire.

Attachment 44070

Mario, is the 4mm barrel insert rifled or smoothbore??? Primer-only ignition can't be all that powerful, even for a .157" projectile...

A barrel insert installed from the muzzle leaves the chamber end unsupported...The Luger chamber is ~.386" dia and the bore is ~.346" dia...So the barrel insert is unsupported at the chamber end by ~.040" total...(.020" radially)...So you can't have too much chamber pressure or it would expand the insert, making it 'difficult' to remove...

[kurusu]

Originally Posted by sheepherder

Mario, is the 4mm barrel insert rifled or smoothbore??? Primer-only ignition can't be all that powerful, even for a .157" projectile...

A barrel insert installed from the muzzle leaves the chamber end unsupported...The Luger chamber is ~.386" dia and the bore is ~.346" dia...So the barrel insert is unsupported at the chamber end by ~.040" total...(.020" radially)...So you can't have too much chamber pressure or it would expand the insert, making it 'difficult' to remove...

Now you got me. This contraption was popular in Germay where it didn't need registration ( there were pistols exclusively for this type of cartridge either made on purpose or modified ). Here I've never seen one so can't really answer.

Apparently nowadays these things must be registered as firearms in Germany. So my guess is they will be headed the same way as the dinosaurs

[Schupo]

Originally Posted by sheepherder

George, I find that a curious comment...I have fired three different .22 Luger sub-caliber conversions in the past Summer and didn't find them much trouble to use...

Ed's 4-piece 4mm conversion doesn't seem all that complicated either...(Although I would prefer the 4mm muzzle clamp that uses the interrupted rear nut)...

Could you explain further???

Yes, from a police training standpoint the single shot nature of these inserts are not realistic. They are fine for indoor target shooting to teach marksmanship but since they must be loaded and then unloaded after each shot they do not mirror the tactics taught for officer survival.

The goal of police training (when I was such a trainer) was to do repetition drills to intill muscle memory without having to think through the process. Police training is set up nowadays to have polilcemen draw, fire, and recover from a snapped in holster in order to simulate what might happen during an armed encounter. Having to stop and futz with your pistol between shots is counterproductive to such training.

Back in the 1960s dead policemen were found with empty shell casings in their hand after shooting scenarios. This was because rangemasters had allowed policemen to carry their brass bucket with them from one yardline to another. The rangemasters were inadvertantly allowing the officers to instill muscle memory from repeatedly emptying the spent cartridges from their revolvers into their hand in order to throw it into the brass bucket. It got people killed and when instructors realized what was going on the training was changed.

So, from this standpoint these single shot sub caliber units are not conducive to keeping you alive in a shooting. The multi-shot .22 caliber conversion kits do not have this drawback.

George