Yes, it should.
Yes, you'll have to grind down the right side of the hammer to clear. Just follow what the original hammer looks like, it only has the left side on, right side cut off.
Works great in mine, I love it!! It does take some fitting though like the reviews below mentioned. Take your time and make the hammer look like the stock hammer. Also hammer in the roll pin then shave it little by little until the safety engages properly. It does work and it’s VERY nice in the NAK9.
No, it will not. the hammer will crash onto the bolt restricting it from making a full connection to the firing pin.
It will work alright..unless you want uncontrollable bumpfire at around 900 rpm..utilize your original factory trigger spring that came with your nak 9 and make sure to use the additional trigger pin spring (stainless) that comes with your alg trigger kit...I have the exact same set up..using only the alg parts my gun turned into an uzi..it would bump from the shoulder with a tight grip