EPLowers Polymer Lower

A few weeks ago I had talked with Chris from www.EPLowers.com about the 80% polymer lowers that they are producing, he was really informative and helpful. He was awesome enough to engrave the SpartanTC81 logo into the lower, which made this already cool project even better in my eyes.

The reason that the EP Lowers can be finished using a Dremel and a drill, is that the firing control group pocket contains a white polymer. The idea behind it is to remove all of the white polymer from inside the pocket until you get to the solid black (or whichever color your lower is). Once you get to the solid color you will still have to remove some of the colored polymer to allow for the proper fit of the firing control group.

In the picture above you can see a good majority of the white polymer has been removed. Notice the black "bars" that are on the sides, these help you gauge where you are at while using the Dremel to remove the white polymer. They do disappear when you are close to the bottom and at that point it is important to take your time and watch for the final layer of white polymer to give way to the colored polymer below.

Above you can see that there are a lot of shavings from removing the white polymer. If you have access to a shop vac I highly suggest rigging it so that it will aide in the removal of the shavings while you are working.

As you get further down and the walls of the white polymer become thinner you can actually use a set of pliers to remove it.

Above you can see that the white polymer has given way to the black polymer below. You will also notice that the trigger hole will need to be milled/dremeled out to allow for the trigger to fit in. When you do this be careful not to remove too much or it will be possible for your springs to fall through the hole.

When drilling the holes for the trigger and hammer pins I highly suggest drilling straight through from one side to the other. The directions on EP Lowers site say to do them one side at a time, which I did and because I was doing it by hand the drill walked and ended up miss drilling the holes (this was my fault). I ended up with the left side holes sitting lower than the right side, and this lead to the hammer being off center, which lead to the trigger not releasing it. 

Also my selector hole was off, it still worked but was extremely stiff due to it being angled.

Even though I miss drilled the holes I was able to fill them with epoxy (double bubble extra strength epoxy) and drill from the right hand side. This straightened out the issues and will be strong enough to hold the pins and selector in place (however I chose to go with KNS anti walk pins just to make sure they won't move).

As for the quality of the lower, I cannot speak on the durability of it yet since I haven't had the opportunity to toss an upper on it and run it to the range; but it does have a solid feel. It has very little give compared to some of the other polymer lowers I have messed with before and the polymer has a nice feel to it. The "finish" of the polymer is clean and some people who have seen the pictures of the lower have actually mistaken it for a billet lower. 

Once I have a few hundred rounds on it at the range I will be writing a follow up post along with some videos of it performing at the range. I have no doubt that it will work just fine and will be a great range rifle.

Overall this was an awesome learning experience, it gave me a whole new appreciation for building a lower. If you like to tinker on your own firearms and are looking for a new project head on over to www.EPLowers.com and check out what they have to offer.