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Thread: 80% Lower AR Build
02-28-2014, 11:21 PM #1
80% Lower AR Build
Purchased an E P Armory 80% polymer lower in OD green. I dont have a whole lot of faith in polymer AR lowers but considering its jigless and that i own a dremel i figured.. What the hell.. Lets try it. Ive spent $60 on stupider things. And they also have a lifetime warranty for normal malfunctions so thats a plus.
With hopes that im able to complete this build and have a fucntioning ar i would assume it will eventually fail at the rear takedown pin area as polymer lowers seem to be infamous for. If it does... Lets see how many rounds it will take first.
This is my first 80% build though ive assembled a few ars. I wanted to document the build and get feedback from more experienced NES'rs. I also plan on reviewing the lower once the rifle is complete.
I ordered OD green... Imo it looks like they melted a bunch of those army guy toys and molded this out of it. Its no where close to my moe stock in od. Havent decided if im gonna paint it or not and what color if i do paint it.
Started by drilling a few tiny holes then eventually worked my way up to what u see here. So far so good.
Eventually i worked my way up to a 3/8 bit then took it down some more with a dremel. I used a flat bottom cutting bit (#196).
After that used a sanding bit then a file.
Waiting for a cmmg lpk to come in. Until then im done.
Im using my iphone for pics and everything else on this thread so i apolgize for the picture quality.
02-28-2014, 11:32 PM #2
02-28-2014, 11:35 PM #3
Not quite but close... Im waitn for the lpk before i remove any more material... Compared to one of my lowers its about 1/16 of an inch to go
02-28-2014, 11:52 PM #4
- Join Date
- Dec 2012
- south of Dedham
Must enlarge the trigger hole too.LTC NR MA,NH,ME
03-01-2014, 12:12 AM #5
Any suggestions on the trigger hole? Might have to freehand it with the dremel.
03-01-2014, 09:54 AM #6
Do you have a drill press at least to drill out the selector and fcg pin holes?
03-01-2014, 10:04 AM #7
Yeah drill press and at the very least a hand drill.
If you have a hand drill find some one to make you a drill/tapping block . It's just a sq block of steel with a hole drilled in it matching the size of the drill bit. It helps you keep a hand drill straight .If I offended you , you didn't get the joke.
i hate prexis....
i need a ak47 bolt/carrier and front trunnion.
03-01-2014, 10:15 AM #8
I have done one on a mill, and will probably do more in the future. Sure the plastic cuts easily with a hand drill or dremel, but there are some important dimensions that need to be precise.
+1 for doing it yourself, that's all of the fun in a project like this, but I personally would not attempt this without at minimum a drill press.TY73127
"Beneath the rule of men entirely great, The pen is mightier than the sword." -Edward Bulwer Lytton.
03-01-2014, 10:19 AM #9
I was considering buying a cheap harbor freight drill press for this project... Looks like thats gonna be the way to go.
03-01-2014, 10:39 AM #10
I've been looking into the EP lowers. The jigless design and centering indents for the FCG pins is pretty a interesting idea.
Please keep us posted on your thoughts after its done.
Last edited by Almostelmo; 03-01-2014 at 10:42 AM.