Question on barrel replacement ...

Ron Wood · 05-28-2011, 08:19 PM

G.T.
A half turn out (180 degrees) seems a bit much for hard hand tightening. I would expect about a a quarter turn for hard hand tightening and about the width of the extractor groove if you are using a wrench just before the final “ugh” crank on the wrench. As you probably know already, the torque of the barrel is an “interference” or “crush” fit. Looking at the original specification drawings you can see that there is a 0.1mm taper, or dish, on the rear barrel flange that allows for a final torque for this crush fit. Naturally, the final fit may vary from one gun to the next (but in actual production, this was usually a very small and insignificant variance), so if your replacement original barrel bottoms out too soon, you may have to remove a tiny amount (I don’t do thousandths well

) from the rear of the flange to get the barrel to properly index. You might have to recheck headspace, but I doubt it.
Best to you backatcha,
Ron

05-28-2011, 08:19 PM	#12
Ron Wood Moderator 2010 LugerForum Patron Join Date: Jun 2002 Location: Santa Teresa New Mexico just outside of the West Texas town of El Paso Posts: 7,051 Thanks: 1,119 Thanked 5,286 Times in 1,728 Posts	G.T. A half turn out (180 degrees) seems a bit much for hard hand tightening. I would expect about a a quarter turn for hard hand tightening and about the width of the extractor groove if you are using a wrench just before the final “ugh” crank on the wrench. As you probably know already, the torque of the barrel is an “interference” or “crush” fit. Looking at the original specification drawings you can see that there is a 0.1mm taper, or dish, on the rear barrel flange that allows for a final torque for this crush fit. Naturally, the final fit may vary from one gun to the next (but in actual production, this was usually a very small and insignificant variance), so if your replacement original barrel bottoms out too soon, you may have to remove a tiny amount (I don’t do thousandths well) from the rear of the flange to get the barrel to properly index. You might have to recheck headspace, but I doubt it. Best to you backatcha, Ron __________________ If it's made after 1918...it's a reproduction