Just picked up a mdl 11 in 223 for a build in 223 AI. I see that the longest OAL I'm going to be able to get in this magazine will be 2.30". I don't have the barrel yet but it will be a 1-8 twist to maybe play with some heavy bullets. Are the aftermarket barrels throated longer than the factory ones? Already sold off the old sporter barrel. I don't want a single shot. Anyone else have this problem and if so how did you correct it?