80% poly lowers $50

cap6888 · Jan 13, 2014

Me too. The "jig less" claim is not all it's cracked up to be. I think I a going to get a jig, fill the holes with JB Weld, and re drill them. Luckily they were the blemishes, so I wasn't expecting work so of art. Once I get them perfect, I figure I would get them cerakoted, so they look good.

SneakySh0rty · Jan 13, 2014

jpo183 said:
Ok installed the LPK today. Here is the video, sorry for the bad quality. I do have a question that needs answering. If I dont get any responses here Ill post under the rifle section

Comments about your vid:

Blemished units are only suppose to have cosmetic issues, no functional issues. Now what determines hole placement marks as a cosmetic or a function error, not sure. But, mis-aligned holes ive read/watched was a common issue with ep lowers. You are correct though, given the opportunity, pilot holes are the way to go.

Regardless of an 80% polymer, aluminum 80%, or bought completed lower. Pretty sure that trigger should operate the same across all of them. Before you remove more material, examine the trigger assembly and see any possible points of restrictions causing the trigger to move only part of the way first.

You talk about being able to throw it around. IMHO, you wont be able to throw it around long with the grip attaches to the lower. The way you did it, any abuse over time, I believe will work it lose or break it. Clean cut threads allow things to be held nicely but also have the ability to be removed or replaced easily. But all is not loss, I wonder if a heli-coil can be used to fix that.

I watched quite a few reviews of ep lowers. Even with the price, i wouldnt trust running it hard. Here is only of the more recent reviews ive watched.
http://www.youtube.com/watch?v=Pc6FvKDeJgM

FrankOceanXray · Jan 13, 2014

Are you to drill the holes first... Prior to carving out the pocket?

jpo183 · Jan 13, 2014

SneakySh0rty said:
Comments about your vid:

Blemished units are only suppose to have cosmetic issues, no functional issues. Now what determines hole placement marks as a cosmetic or a function error, not sure. But, mis-aligned holes ive read/watched was a common issue with ep lowers. You are correct though, given the opportunity, pilot holes are the way to go.

Regardless of an 80% polymer, aluminum 80%, or bought completed lower. Pretty sure that trigger should operate the same across all of them. Before you remove more material, examine the trigger assembly and see any possible points of restrictions causing the trigger to move only part of the way first.

You talk about being able to throw it around. IMHO, you wont be able to throw it around long with the grip attaches to the lower. The way you did it, any abuse over time, I believe will work it lose or break it. Clean cut threads allow things to be held nicely but also have the ability to be removed or replaced easily. But all is not loss, I wonder if a heli-coil can be used to fix that.

I watched quite a few reviews of ep lowers. Even with the price, i wouldnt trust running it hard. Here is only of the more recent reviews ive watched.
http://www.youtube.com/watch?v=Pc6FvKDeJgM

The FCG is found to be defective, I tried it on 3 different lowers.

I did unscrew the grip so I could remove the saftey and the threads look really good, we shall see though. That is my main concern, the grip threads. Everything else feels good and strong.

As far as the hole drilling process. I removed the insides first then drilled the holes. It doesn't matter either way, my suggestion if this were pre 10/1 would be to simply drill one side of the holes first, dry fit, then drill the rest (as well as use pilot holes for alignment)

The lack of a jig is not that big a deal IMO. I do not think the jig would matter with the exception of the hole placement.

FrankOceanXray · Jan 13, 2014

I think the order of operations does matter. Drilling into a solid piece should help prevent the bit from walking? That the hole lines up...?

SneakySh0rty · Jan 14, 2014

FrankOceanXray said:
I think the order of operations does matter. Drilling into a solid piece should help prevent the bit from walking? That the hole lines up...?

I can see your rationale. But in this case, IMHO, drill the pocket first. Less material for the bit to go through when doing the holes, less chance of bit drifting. I suggest pilot holes on each side and inspect they line up. If not atleast then you can adjust and not worry about having larger than necessary holes.

Sent from my SCH-I545 using Tapatalk

jpo183 · Jan 14, 2014

SneakySh0rty said:
I can see your rationale. But in this case, IMHO, drill the pocket first. Less material for the bit to go through when doing the holes, less chance of bit drifting. I suggest pilot holes on each side and inspect they line up. If not atleast then you can adjust and not worry about having larger than necessary holes.

Sent from my SCH-I545 using Tapatalk

This. Spot on.

DeadeyeJack · Jan 17, 2014

bump to follow

my69rox · Jan 29, 2014

had to buy one to try, I work at an auto shop so had air tools and a lot of other tools to make easyer. Took me 4 hrs with doing my other work also. Yes the trigger and hammer holes are a pain , TAKE YOUR TIME !!!!! Think 6 times then cut or drill in this case ... lol If you screw up fill with plastic weld, let dry, drill again correct. I also would put KNS or what every pins in so hold better and will help keep true. I made mine for a CMMG 22 kit that I still need if anyone has one cheap . I feel if you wanna have some fun and understand the AR platform a little better , it is a nice project. I feel good about mine , I know it is not perfect BUT I spent 50 bucks and had a few hrs. in labor and now have a workable lower that I feel good about.

DeadeyeJack · Feb 1, 2014

my69rox said:
I also would put KNS or what every pins in so hold better and will help keep true.

I don't understand what you are trying to communicate here, but it sounds like something I would like to know, as you were successful in your build and have some good advice to share. Please give a bit more detail.

80% poly lowers $50

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