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the easiest way would be to drill a small hole where you want your pin and load 5 rounds then stick a small bit or something into the hole until it touches the bullet rest this will give you the length of your pin needed to stop follower, then just tack it inside bam all done and if you didnt want to do that to all of them you will now know how far down the follower sits when loaded you can then tack a pin to the follower inside then no weld showing