jantonio54,
Excellent explanation- now I understand. So far, I have not had any problems with my M2 functioning. I have fired about 100 rounds- Hi base 00 buck, high base and reduced recoil slugs, and even dove loads (low base #8), with no problem. The only accessory is the factory installed +2 mag extension. I don't plan on installing a side saddle or light, so I'm hoping things continue to run smoothly. I do completely disassemble the bolt, remove the trigger assembly, and thoroughly clean and lubricate everything each time I shoot it.