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I forgot my technical question during an earlier post about colt PTFA quality.
The 20 GA is missing the front sight bead.
What size are these holes ? Or should I drill and Tap ?
Thanks,
Mike
 

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Just make a call to the nearest smith, they usually have a box full beads. And you can add some of those high visability sights if you want to.
 

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Shotgun beads come in several sizes and threads. One very common one for American made guns is 5/40 thread with a bead diameter of 1/8 inch. When I get one in for bead replacement, I check for thread size. If its a common one, no problem. If its something different, I will determine what size I can change it to and drill and tap for that size. Very easy to do and doesnt cost much if you already have the drill and tap to work with.
 
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