I'm looking at a 21 Field grade (BTFE, DT, EJ) in the 4700 S/N range. It has 30" barrels marked MOD / FULL, but they measure (with a cheapo brass gage, it's the best I could do at the time) IC / IM. every 21 ive owned seemed to be more open than marked. The end of the ribs look like it may have been cut. I had a VR Trap grade once that looked worse, but had definitely not been cut. So my question is did Winchester just not pay that much attention to the muzzles? Am I crazy?