Edited 10-8-10: This thread was originally just about the mag release extension but I've expanded this to be a 10/22 buildup thread. Scroll down to see the new info.

Not bad considering I don't have a lathe or drill press.



I ended up using my 18V hand drill as a lathe and using the corner of a file I carved a dimple into the center of a scrap piece of aluminum round stock. Then I clamped a drill bit into a vise and drilled a blind hole into the aluminum and tapped it for a 8-32 set screw. I cut it off at 1/2", threaded the screw into the hole, chucked it up by the screw. Again, using the drill like a lathe, I used a file and a bench grinder to turn down the diameter and apply a radius to the end. Then, after a little sandpaper and polishing the extension was done.