I own a OM BH in .357 magnum

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steve8261948

Single-Sixer
Joined
Oct 5, 2006
Messages
398
Location
Central Illinois
with a cylinder length of 1.840". Is it possible to fit a 9MM cylinder to this gun? Do the NM BH cylinders average the same lengths a the OMs? I don't think I've ever seen this discussed on this forum before.
Steve
 

cadillo

Blackhawk
Joined
Apr 22, 2008
Messages
667
Location
East Alabama
I never measured the length of mine, but can tell you that Ruger marketed some of those Old Model .357's as "Convertibles" with a 9mm cylinder. I occasionally see the cylinders for sale on Gunbroker, and believe that I've also seen one sold here in the Classifieds section.

They are out there.
 

contender

Ruger Guru
Joined
Sep 18, 2002
Messages
21,756
Location
Lake Lure NC USA
There is a difference in the OM cylinders & the NM cylinders. Most noticeable by the cylinder boss. Make sure you get a correct one for your gun. And it needs to be the same OAL or a few thousands longer to be honed down to fit.
 

bedrockfred

Blackhawk
Joined
Jan 31, 2012
Messages
992
Location
arizona
Hi I am no expert, but from my experience, they do not interchange. Old model cylinders front snout is much shorter than a new model. And the barrels on a new model ruger protrude farther into the main cylinder frame. But I see plenty of both ,old & new model cylinders for sale!--bedrockfred
 

cjs1945

Single-Sixer
Joined
Sep 15, 2011
Messages
473
Location
Durand, Michigan
I have an old model mane in 1969 with 6 1/2 in. barrel and a old model convertible made in 1971 with4 5/8 in. barrel and 9 mm cylinder works great in both of them. Both shoot accurate with 9 mm, but i have not shot with 9 mm cylinder much because 38 spl. is a lot more covenant when I'm not shooting .357 mag.
 

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