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If you've ever cleaned an AR, you know it's difficult to keep patches on the rod while traversing the action. A bore guide that fits snugly into the upper and is properly sized will make this easier. It also prevents out of bore line rod entry into the bore which can cause abrasion/wear to the chamber and throat. A good bore guide is also long enough to keep the upper and lower separated while cleaning, preventing pinched fingers or rub marks on the top of the lower's stock boss.
I use one of the Delrin guides with the o-ring at the chamber end and it works well. The o-ring really only holds the guide in the chamber since the muzzle is lower than the action while in the gunvise anyway.
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