The tip of the level 10 bolt is supposed to be 0.685" according to AGD. Twist lock barrels have more of an issue than threaded barrels for a couple of reasons.
1) The twist lock barrels can get pushed to one side a tiny bit which means they are no longer centered in the body, which reduces the clearance on the side it is pushed against. Threaded barrels are always centered and don't move.
2) Twist lock barrels are the breach, so a small bore barrel will be small in the breach as well. Threaded barrels may have a small bore, but the breach is a constant in the gun itself and it is usually larger than most barrels on the market.
1) The twist lock barrels can get pushed to one side a tiny bit which means they are no longer centered in the body, which reduces the clearance on the side it is pushed against. Threaded barrels are always centered and don't move.
2) Twist lock barrels are the breach, so a small bore barrel will be small in the breach as well. Threaded barrels may have a small bore, but the breach is a constant in the gun itself and it is usually larger than most barrels on the market.
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