The GG spring is lighter, it combined with the trigger is what gets the 2lb decrease in pull. Should work fine for you but I'm not sure how much difference the spring alone will make in pull, maybe very little I would assume.
The gg spring will slightly reduce the trigger pull by 1 - 1.5lbs. The gg spring doesn't provide you with the audible click on the reset like you get from the stock. The trigger and the spring together will reduce much closer to the 2lbs.
Visually, here's what I noticed with mine: A very apparent difference is that the stock sig spring in my 934 variant had a slight bend in the longer leg of the spring close to the coil (all of my P320s have this), while the longer leg of the GG spring was perfectly straight coming off of the coil. Each spring has the same number of turns in the coiled section.
Based on my experimentation with four 320 FCUs and multiple trigger kits, the GG trigger and spring will decrease pull by about 2 or slightly more lbs (Lyman digital gauge, averaging MANY pulls over the four FCUs). The spring alone accounts for about 1/2 lb of that and the trigger itself the other 1 1/2 lbs. This concurs with what Bruce Gray states in his trigger video. The GG spring will slightly decrease the crispness of the reset. Problem is, GG will not sell the spring as a separate item (I called to check). They will replace the spring if damaged during installation or during use IF you can provide proof that you purchased the whole trigger kit.
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