On the left is a stock (factory) bolt release.
On the right is a Auto bolt release.
To make your own auto bolt release simply use a small file or dremel and remove excess material so that your bolt release ends up looking like the one to the right.
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***Note***
To ensure proper function of the auto bolt release, you do NOT want the top of your hole to be filed flat. Again, you want your auto bolt release to ressemble the one to the right.
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When you do it make sure you have the spring that puts tension on the bolt lock part in the appropriate spot. Will save you the hassle of trying to figure out why it wasn't working. First time I did it I made that mistake and took me like 2 hours to get it working, the second time I modded one took me less than 5 mins.
10/22 was my first purchase too, cannot complain about it other than horrible paint job.
So with this mod, do you lose the ability to lock the action in the open position?