Feinwerkbau History No. 1 patent breech?

[Frod733]

Greetings.

I was able to obtain one of these fine underhammer pistols. It seems I read somewhere that these have a "patent breech", that is a breech area of a different size than the barrel. Is anyone aware of this? And, if so, what is the diameter of that area? Looking to be able to clean it properly. Thanks.

 

[Nobade]

You should be able to look down the barrel with a flashlight and see if it does or not. To clean them I use a patch wrapped around a much smaller than bore size bronze brush.

 

[Frod733]

Thanks. At 36 caliber, it is hard to see down the long barrel to define anything.

 

[No second place]

I have some match pistols with the PIA breech. I have had to turn down a bottom scraper brush to properly clean these. A cleaning patch wrapped around a .22 cal. brush will swab it but the bottom scraper is needed to be through...nsp