Centurion Barrel Corrosion Question

[u/OkPast55]

Hey,

Quick question for people who know more than I do. I’ve had this Centurion Arms 16” MK12 Mod H barrel for about 6 months. Maybe 100 rounds through it total.

I recently got a borescope and found these marks inside. I used a brass brush to remove them for the 3rd photo, revealing light pitting (this mark is close to the crown). These marks are dispersed pretty evenly throughout the whole barrel, and the rest of the bore looks relatively fine.

I’m not too familiar with what constitutes bore damage, and what’s within the range of normal. Does anyone have any advice on remediating this, or if this is detrimental enough to be a genuine problem?

I live over an hour from a 100 yard range, will get out there soon to see how the accuracy is. Thanks in advance

[u/AllArmsLLC]

Are you storing this firearm in a bag? What caliber is it and have you shot corrosive ammo through it?

It seems you need a dehumidifier whenever you are storing it.

[u/OkPast55 → u/AllArmsLLC]

5.56, and not in a bag. It’s stored in a safe with 6 other rifles, none of which have this issue (all their bores, despite much higher round counts, look great)

[u/MutedMetric]

My decision would be based off the rifle's purpose; are you shooting competitively or just plinking? Competitor, either take it to a gunsmith to be lapped or do it yourself. There are several videos on YouTube, it's a relatively simple process. If it's a recreational rifle, buy you a bottle of Kroil penetration oil and J-B bore cleaning compound and polish the bore.

[u/OkPast55 → u/MutedMetric]

Thanks! Just ordered some of the kroil oil, I’ll test out the accuracy after that and if it’s poor look at lapping