The Brass rod only keeps you from bending down on the Barrel as you attempt to Remove it and install the other.
A 4 inch barrel isn't going to be as susceptible to this as a six or an 11 are.
But you would be surprised at how easily they do bend ,the brass is to protect your rifling ,and if you can find any Bronze thats even better ,.
The new barrel will twist a little and not harm anything , but i wouldn't go over even 1/8th if it were on my gun.
Mostly to line up the site , i have had to straighten several Barrels and Slides , and i have the Jigs to do both.
A barrel can be bent and not noticeable to the eye or to any square , the Brass rod will tell you real fast if that is the Case.
I don't touch my Collector Luger's ,but i tweak my shooters all of the time.
You can make sights for the Artillery model out of those off a 98 Mauser or even those off an SKS rifle and they look just like the originals.
The Naval Rear sights are little more tricky to do , because in no way can i reproduce a rear Toggle Link , but they can be reproduced if you have the time .
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