You might think about building a Brass Rod that will fit tightly into the Barrels when you are trying to twist them off. Ive replaced two six inch Barrels, and if you don't have the support rod it is easy to bend a six inch barrel with the kind of Torque you will need to R&I the barrels.
Also what i have found out is that when setting the head space with the Go and No Go gages , using a Chamber reamer is great . but a little cutting really gees a very long way in this. Take your time here ,do a little cut then Check it with the gages , if you dont , then expect to be removing the Barrel again after you find out the Head Space is to much and the extractor doesn't latch on the Case rim. Usually stove piping is caused by this if the extractor does happen to latch an the gun Does fire.
Lugers are pretty tough , ive seem guys shooting them with excessive Head Space and not have any trouble ,but after shooting the tell tale sign of this is that the inside of the gun is covered with powder residue from venting past the shell casing..
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