I bought a PF45 polymer 80. I went to do my project and when I opened the box there was no milling bit. Just the two small bits in a bag. I thought it was odd, I have done a few 80 percent projects and always got a new milling bit. But it wasn't that bad, I had a few other milling bits sitting around. Then I started to put it together, I found out that there is a special slide lock spring with this model that is suppose to be in this kit. It wasn't. So now I am searching for that spring and I can't finish my project. To be fair, I haven't contacted Arm or Ally about this. But I will right after I write this.