22 CM, carbon ring and first timer with a borescope...what is this inmy barrel?

VegasAg · 2024-09-20T14:02:08-0400

I ran a few wet patches with C4 the scored the barrel. These are after pics. What is that bkob on the left?

oldrifleman · 2024-09-20T14:08:38-0400

That is the Gas port I believe.

VegasAg · 2024-09-20T14:36:00-0400

Is that just carbon gunk accumulating around the port? I've just never seen that before.

oldrifleman · 2024-09-20T15:06:49-0400

Often you will get some copper that catches on the trailing edge of the port where the barrel wears.

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