I have two AKTs. One from the pre-order,l and one that I ordered this week.l for my PSL build. The new one came with the auxiliary spring, and it definitely improves the trigger for me. I wrote ALG about getting another auxiliary spring for my first AKT, they asked for my address and said they'd have the shipping department send me one. It doesn't make the trigger heavy, but just enough that I feel safe in a defense situation. I also ordered the high energy hammer spring to use with the new one, which also adds a little weight. I was worried about the single-wire hammer spring but I see no reason for there to be any issues. Just kinda looks weird. The newer trigger feels noticeably better. Zero take-up, slightly heavier (but still light) with a crisp break and reset. The new one feels almost identical to my CMC 4.5lb flat triggers, but unfortunately I don't have a gauge to test it. The AKT feels better than any AK trigger I've felt, and the new one is far better than I would have imagined possible.