Well, in the name of 20% more mag capacity, I figured I would attempt a 4 to 5 round 410 mag conversion, it looks easy right?

Cut a little off the bottom of the follower and it should go down enough to allow the 5th round in right?

Wrong, the follower is now boned, and pops out if you push it too far down in the back, it wont even work for 4 rounds anymore, so, if youre going to attempt this, DONT, something other than follower length determines whether 4 or 5 can fit, probably spring compression,  but that would mean cutting off loops and rebending the hooks for the follower.

Oh well,  out 20 bucks, any screw up a mag body and have a spare follower?

No problem, show me where you can get one, with shipping for under 20 bucks..........feel free to add in what you did to get it to take 5 rounds as well, sharing info is a good thing........