Need advice after painting

I had my AR10 painted. I noticed the guy painted inside. Well I took it to the range today. The first 20 rounds was a crap shoot. One failure to feed. One failure to extract. Mag was hard to get out. 1 look like like strike.

Second mag of 20 rounds not a single issue. Same ammo, same lot. I guess my question is could the paint had added thickness inside the gun and I just need to break it in now? The purpose of the trip was to sight in my irons. Adding an LPVO later