Marks in the bore?
My cousin has a AR-15 which he occasionally shoots, but mostly keeps it for the “Just in case” scenario as a defense rifle. I was shooting it this weekend, just at some cans 30yds out, nothing long range, but it wasn’t shooting up to par at all.
So, I stripped it down, took a peek at the barrel and discovered three lengthwise “skid” marks in the bore, going from the chamber to about 1/2 of the way to the muzzle. Now this gun was bought used, and is an older model (A2 serial no. in the 8000s), but is in good external condition and has been shot very little. What is up with this and how did it get in the bore?
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Has the barrel been cleaned since shooting? Could be jacket or lead residue? That copper can be hard to get out at times. Stress cracks should not be visible without it failing. My match .22 will start leading very quickly with cheap lead ammo, and it’s tough to get out also. What do the marks look like?
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Scrubbed the hell out of it and they are still there. They appear to be long, thin straight marks on the surface of the lands and grooves.