Upon receiving my order I discovered that I was mistakenly given a barrel component, living on a remote island this was a worry as a return would cost hundreds; but not to worry as to my surprise upon emailing OOD about this mix up, I was amazed to be sent the spring at no extra cost.
OOD customer service is just phenomenally friendly and fast, If I could give a 6 star review - I would.
Nice easy prime and brought the darts down into the iron sight range.
Also don't be like me and take out all the screws and try to pry it apart, I was able to swap the springs by just removing the left slide piece.
Hard to complain about this. I was stoked when I discovered this lower-powered spring for the DZ MK2 which is too OP for our typical casual blaster battles. It's exactly what I wanted.
One improvement opportunity: either instructions or a video on the channel that describes the swap process. It was easy - I just had to look at another YouTube channel to confirm the process.