Guns 80 Poly Project Finished

mstraus · Mar 16, 2015

Topped off with a 3X9 40mm. First AR build for an old C&R guy.

DC-W · Mar 16, 2015

Fine work

You choot it yet?

mstraus · Mar 16, 2015

Nope Hope to this weekend.

kenpo333 · Mar 16, 2015

I've got a couple poly lowers that I finished over a year ago and haven't put an upper to them yet. You make me want to get back to work on some uppers. Just got worried as to how they would hold up.

DaemonAssassin · Mar 17, 2015

I have to echo kenpo. I am also concerned about how long they would hold up.

Chriss · Mar 17, 2015

at least we can see feet

j_h_smith · Mar 17, 2015

DaemonAssassin said:
I have to echo kenpo. I am also concerned about how long they would hold up.

I can only imagine this was the mentality back in the 60's when the "aluminum" rifles came about. Back in the 90's I had one of the State Arms AR50 uppers. You would think that if any round would punish the lower, this would be the one. I shot over 100 rounds and I did not have any issues with the aluminum lower I used. As a matter of fact, I still own that lower and it now has a 16" pencil barrel on it. Talk about going to the extremes. I own a few poly lowers and will eventually build one into a complete rifle. I'll have no issues with this lower and it will shoot as well as anything else I own.

I promise...

BossmanPJ · Mar 17, 2015

I have a poly lower as well. Have a PSA Dissipator upper on it and have shot a few thousand rounds out of it. Haven't had any problems yet and it doesn't get any mercy. Only real issue is the rear takedown pin is getting a bit loose when pulled out. Probably from the polymer starting to wear from taking the upper off and putting it back on a bunch of times.

DaemonAssassin · Mar 17, 2015

j_h_smith said:
I can only imagine this was the mentality back in the 60's when the "aluminum" rifles came about. Back in the 90's I had one of the State Arms AR50 uppers. You would think that if any round would punish the lower, this would be the one. I shot over 100 rounds and I did not have any issues with the aluminum lower I used. As a matter of fact, I still own that lower and it now has a 16" pencil barrel on it. Talk about going to the extremes. I own a few poly lowers and will eventually build one into a complete rifle. I'll have no issues with this lower and it will shoot as well as anything else I own.

I promise...

Link up with me in 10 years and many thousands of rounds, then we'll talk turkey with poly lowers.

fidelity · Mar 17, 2015

mstraus said:
Topped off with a 3X9 40mm. First AR build for an old C&R guy.

Congrats! Looks nice and I hope it shoots well. :thumbsup:

Btw, there is some irony in making a rifle whose receiver is off the books but putting your photo with it online.

DavidWB · Mar 17, 2015

Looks very nice! Have fun shootin'!

Kelson1066 · Mar 17, 2015

DaemonAssassin said:
Link up with me in 10 years and many thousands of rounds, then we'll talk turkey with poly lowers.

Will you settle for 3 years and 10K rounds?

I run a polymer lower on my fun to shoot for shi*s and giggles 16" rifle and have had no issues with melting accuracy or separation of the DPMS upper from the lower.

So I think they have some promise like the polymer lowers on most modern pistols.

But that's another debate.

Also OP nice project. Looks like it'll run smooth. Please send a range report when you get a chance.

outrider58 · Mar 17, 2015

Looks great! Welcome to the world of the Black Rifle. :thumbsup:

DaemonAssassin · Mar 17, 2015

Kelson1066 said:
Will you settle for 3 years and 10K rounds?

I run a polymer lower on my fun to shoot for shi*s and giggles 16" rifle and have had no issues with melting accuracy or separation of the DPMS upper from the lower.

So I think they have some promise like the polymer lowers on most modern pistols.

But that's another debate.

Also OP nice project. Looks like it'll run smooth. Please send a range report when you get a chance.

I can settle for 10k rounds over 3 years. Have you had any cracking or other issues with it?

Ragnar · Mar 17, 2015

How did you machine out the 80% lower? With a drill press?

Kelson1066 · Mar 17, 2015

DaemonAssassin said:
I can settle for 10k rounds over 3 years. Have you had any cracking or other issues with it?

No cracking or any performance issues I can think of. I even did a couple of mag burns just to see if it could hold up to the heat didn't have any issues.

The biggest gripe I had was that my adjustable stock didn't feel like it had a 1:1 match with the threads on the lower so I had to play with it to make it work.

The next step will be using it in competition. I think that will be the real stress test. Best part is if it breaks I'm only out $45.

DaemonAssassin · Mar 17, 2015

Ragnar said:
How did you machine out the 80% lower? With a drill press?

I hear you can use a Dremel tool.

DaemonAssassin · Mar 17, 2015

Kelson1066 said:
No cracking or any performance issues I can think of. I even did a couple of mag burns just to see if it could hold up to the heat didn't have any issues.

The biggest gripe I had was that my adjustable stock didn't feel like it had a 1:1 match with the threads on the lower so I had to play with it to make it work.

The next step will be using it in competition. I think that will be the real stress test. Best part is if it breaks I'm only out $45.

Were you slow firing it or have you done any mag dumps?

marcus6576 · Mar 17, 2015

I have two James Madison Tactical poly lowers. One with an Oracle 5.56 upper and another with a custom 300 BLK upper. I've put 1000 rounds through the 5.56 and 300 rounds (super) through the 300 in less than a year. So far they are holding up nicely. I machined them both out on a drill press using an end mill. No issues at all. I have inspected both of them after each session and there are no visible stress cracks or discoloration of the polymer.

mstraus · Mar 17, 2015

I used the jig provided by vendor and drill press with pits and end mill. Just took my time. Cross slide vise is a must IMHO. made it so much easier to get sides nice and smooth. As for picture. It is totally legal to do and I am not worried. Lots of hype but no action.

Guns 80 Poly Project Finished

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