I've got three different Colt lowers with three different Geissele Hi Speed NM trigger kits. Two are 0.170, one is 0.154.
All have hammer pin walk problems. The trigger pins don't move at all.
The hammer pins do not rotate and are quite tight in the bores, even the standard trigger/hammer pin in the 0.154 is tight in the receiver's hammer holes.
I am using the Geissele pins with the grooves on the left hand side of the gun (bolt release). The hammer pin does a lot of walking between 50-100 rounds. At about 300 rounds it looks bad enough that I have to smack it back in for fear of it coming out.
It really bit me in the butt a few weeks ago at a 3-gun match. I was up to shoot and I looked down at my gun and see that the hammer pin has walked completely out of one of the left receiver hole. The RO let me smack it back in real quick with an empty .223 brass and a 30rd mag. I had shot about 100 rounds when this happened.
I love the feel of the trigger, I hate that the damn hammer pins walk. This can't be an isolated thing, I've got 3 lowers and 3 trigger kits with the same issue.
I'm about to go back to a JP kit with KNS pins because at least I don't have to worry about them.