Anyone telling you that you have to lap a barrel to get better than 2MOA is trying to sell you something.I beg to differ. I am a varmint shooter. If you are going to hunt big game, then 2 MOA is not as big of deal.
I have a couple of old military rifles that will shoot 1MOA and I can guarantee you that the armorers in Sweden did not lap the barrels on their military issue bolt rifles.
Excessive metal fouling is a worthwhile rationale for the average shooter to lap a barrel or have it lapped.
If the gun won't shoot better than 2MOA, that's a problem, all right, but I wouldn't start trying to fix the problem by lapping the bore. There are other things to check/correct first. Lapping the bore can help wring the last few tenths of an MOA of accuracy out of an already accurate bore, but it's not going to turn a 2MOA gun into a tackdriver.