Part 3:
The barrel extension usually only needs the feed ramps polished and the sharp edges knocked off the 2 lugs shown in the last pic below.
Notice how the rough machine marks run at 90 degrees to the nose of the cartridge (scraping a little off the bullet on the way in).
BAD.........
GOOD.........
Also note how I knocked off the sharp ridge down the center, which will scratch the case on the way into the chamber.
On some guns the two lugs shown below will make longitudinal cuts/scratches on the shoulder and neck of the case upon ejection.
Knock off the sharp points and slick up the edges a little to cure this problem.
The barrel extension usually only needs the feed ramps polished and the sharp edges knocked off the 2 lugs shown in the last pic below.
Notice how the rough machine marks run at 90 degrees to the nose of the cartridge (scraping a little off the bullet on the way in).
BAD.........
GOOD.........
Also note how I knocked off the sharp ridge down the center, which will scratch the case on the way into the chamber.
On some guns the two lugs shown below will make longitudinal cuts/scratches on the shoulder and neck of the case upon ejection.
Knock off the sharp points and slick up the edges a little to cure this problem.
