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First I must say I've never drilled a barrel (yet), with that said....

You may be OK with a regular length bit, but a shorter one would be stiffer and less likely to wander.
If you are worried about the drill bit wandering when starting on the barrel a centering bit would probably help out.


These are used to start the hole but not drill all the way through. Get a bit that will just fit through the hole of the receiver with out enlarging it.
If you have a bench grinder you can make a transfer punch from an old drill bit that fits snugly into the receiver hole. This will ensure your actually starting your hole centered in the receiver hole.



I think I read on here somewhere that people have cut a slot into the barrel instead of drilling. You may want to search around for that method also.
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