Since the NY1 spring is only 3LB's heavier than the stock coil will I be able to tell much difference between the stock coil and the NY1 or will I have to go with the NY2 before I can tell a difference?
First of all, there's a lot of misinformation going around about the trigger weight of a factory Glock pistol. I test every Glock that comes through the shop with an electronic scale, and the average weight runs around 7.5 pounds. The NY1 spring ups it to around 10 pounds, while the 3.5# connector drops it to around 5.5.
You'll be able to easily discern the difference between a stock and NY1 trigger spring. 2.5-3 pounds is a tremendous difference when you're trying to press it with one forefinger.
It's not personally a modification that I would do. The Glock trigger is plenty heavy as is.
My own carry Glock 19 has a 5# connector, factory striker spring, and an extra-power trigger spring, sort of the opposite of the NY1. I also re-bend the trigger tab to remove most of the pretravel, install an overtravel stop in the trigger housing, and extensively reshape and polish the firing pin safety. I end up with a trigger that breaks consistently right at 4 pounds, is smooth as greased lightning and totally reliable.
YMMV, IANR, don't modify the trigger unless you completely understand what you're doing,
or you could DIE!, etc., etc...
- Chris