quote:

So it turns out the barrels are soldered in. I was trying to heat up the barrel shank to break the threads/press fit free and noticed the smell of solder flux and then with a bit more heat, had little balls of solder appearing in the back join. So I kept heating it up and tapping with a wooden mallet and eventually it slid off nice and easy. I had to remove the sling mount (which was also soldered) to get the barrel adapter off.

Its all low temp solder, maybe very low silver solder.