The pin and weld is way easier - Get the hole where you need it (indexed muzzle device), insert pin, touch with welder. Done. It's removable. Just requires a little precision grinding, and a sharp drill bit. Bam, off. I pinned a 14.5" barrel with an AAC Brakeout. Decided I wanted that Brakeout on something else, so I removed it, put on the AAC Blackout in it's place, then pinned that thing to the 14.5".
JT is right on the money, it's 1100-degree silver solder. That's a fuk-ton of heat, even with heat-paste to prevent the heat traveling down the barrel.