The one pictured above is for the LPA super sight cut, this one is for the Match cut: http://henningshop.com/products/tanfoglio-fixed-target-sight-for-match-model-h104t-m
It's the softest shooting comp I've tried (and I've tried over a dozen!), up and down is good (about the same as most of the popular comps), but the slap in the hand is almost non existent You can definitely feel the heat out off those gills on your hands though and lots of fire
No one is talking about a longer slide, I the OP is considering a 9" barrel in a 5.3" slide which I dont imagine would be anymore nose heavy than a 6" gun.
I've never shot a pistol with a 9" so I'm curious just how small a charge can make major. Sounds like a fun experiment.
I love experimentation, so I say go for it! I know I get dramatically more velocity between a 4" barrel and a 5", 5" to 6" doesn't seem to be as much, but I'd love to hear what you get going from 5" to 9". I know the ladies will love it
In that case just grab it with a pair of needle nose pliers and pull it out, just cover the hole in the mag release so the spring loaded detent doesn't go flying.
I took a 3/8" bolt and turned it on my drill press using a file and sand paper.
The Allchin is pretty small, your whole thumb won't fit, it's just enough to catch your thumb and keep it in place.