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Linksrds
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Posted: 9/5/2012 10:02:12 AM

I am considering buying one of the many Poly lowers on the AR market.

I have looked at the New Frontier, Plumcrazy and Vulcan lowers. All are priced in the $100 to $130 range for a complete lower assembly.

Please note, this would not be my primary weapon but just looking for a lightweight model for my daughter to shoot as well as a third line back up rifle/ carbine.

I know that the poly lowers are not well received but I have several Glocks and they were not well received when first introduced.

Your thoughts on what is available would be apprecaited.
Target556x45mm
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Posted: 9/5/2012 10:06:44 AM
From what I've read, atm they aren't so hot, give em a few years of development though and i guarantee you that many new AR's will have polymer lowers that actually work.
Krylancelo
"Parts ain't parts."
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Posted: 9/5/2012 10:12:19 AM
[Last Edit: 9/5/2012 10:15:01 AM by Krylancelo]
Buyer beware. Especially Vulcan. I wouldn't give one of those lowers to anyone I cared about unless it was dedicated to a .22 upper.

It's very easy to say "but Glocks!" when talking about polymer AR15 lowers. However, the major difference (and the main reason Glocks are great and these are not) is that Glocks were designed from the ground up as polymer framed guns. These polymer lowers are taking a design created specifically for 7075 grade aluminum forged lower receivers. You simply cannot do a complete materials replacement and expect it to work well. There will be areas that need strengthening and areas that can maybe be weaker based on the qualities of the material(s) you are using. Directly substituting in polymer for forged aluminum is not a prudent idea.
OlCrow
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Posted: 9/5/2012 10:12:35 AM
Go with the Vulcan.

You want to fail...do it right.
-Proud Supporter- Wounded Warrior Project

LastRites
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Posted: 9/5/2012 10:21:15 AM
The saving's in weight is negligible when compared to the strength of the aluminum and there isn't much difference in cost.
RUTGERS95
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Posted: 9/5/2012 10:26:29 AM
Originally Posted By Linksrds:

I am considering buying one of the many Poly lowers on the AR market.

I have looked at the New Frontier, Plumcrazy and Vulcan lowers. All are priced in the $100 to $130 range for a complete lower assembly.

Please note, this would not be my primary weapon but just looking for a lightweight model for my daughter to shoot as well as a third line back up rifle/ carbine.

I know that the poly lowers are not well received but I have several Glocks and they were not well received when first introduced.

Your thoughts on what is available would be apprecaited.


with all due respect, why in the world would you take a chance given that you are doing this for your daughter's rifle? If anything, make sure nothing is going to happen as it only takes one mismeasured commercial, primer mishap, etc to potentially create a messy issue. It's your daughter, get her a metal lower and enhance her safety.

Not saying they don't work, but for your daughter, take the added precaution.

You can get some metal lowers on sale from various places, $29 lpk from palmetto and a cheap stock and be better off.

respectfully
BadKarma555
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Posted: 9/5/2012 10:38:38 AM
New Frontier seems decent. Check out the video of the lowers being pressed in a shop press. I'm going to try one shortly.

BK
dtrosch
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Posted: 9/5/2012 10:39:42 AM

Originally Posted By LastRites:
The saving's in weight is negligible when compared to the strength of the aluminum and there isn't much difference in cost.

This.

But if you are determined, the only poly lower I'd feel comfortable about:


Dr. Heinz Doofenshmirtz approves of the following AR15.com pearls of wisdom...

"Don't seek relationship advice on a gunboard frequented by moody loners." -stoner63a
EdgecrusherXES_45
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Posted: 9/5/2012 10:49:00 AM
I am not understanding why people go with polymer lowers that cost the same as a forged Al receiver that is 100% more reliable. We just had a discussion on the Bushmaster Carbon 15 look a few pages back and you will read about it. Save your money or buy an Al receiver and you will not be sorry 20 years from now when it is still working.
I was born an AR in my hands. Behind the gun I will make my final stand, and that is why they call me .... bad company I cannot deny.... Bad company till the day I die.
BadKarma555
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Posted: 9/5/2012 11:37:00 AM
I'm sure I heard all these comments when Glock started with their poly frames too.

BK
Krylancelo
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Posted: 9/5/2012 11:53:59 AM

Originally Posted By BadKarma555:
I'm sure I heard all these comments when Glock started with their poly frames too.

BK

Already addressed in my post. Not at all an apples to apples comparison.
eviljoe
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Posted: 9/5/2012 11:59:11 AM
I think a new frontier lower with a metal parts kit would be okay: it seems the main issues I've read about were poly-parts related.

I DO think that in 10 years we will have metal lined poly lowers/uppers that are GTG, but I think for a .22LR plinker it'd be fine now.

If you're gonna get her a 5.56, the complete S&W ARs can be had for like $500.
MikefromTX
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Posted: 9/5/2012 12:00:26 PM
Originally Posted By OlCrow:
Go with the Vulcan.

You want to fail...do it right.


THIS.

If you're determined to screw yourself, go all the way.

doubleajaybrock
Im waiting for the Zombies damn it.
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Posted: 9/5/2012 12:21:59 PM
Anti plastic here!
You ain't leading but two things right now. Jack and Shit. And Jack just left town.
gee223
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Posted: 9/5/2012 12:25:59 PM
[Last Edit: 9/5/2012 12:27:28 PM by gee223]
The little piggy who built his home out of straw got all ate up.


Use brick!
bigray1777
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Posted: 9/5/2012 12:31:36 PM
I can see plastic for pistol rounds...rifle calibers no way.
wanderson
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Posted: 9/5/2012 1:29:21 PM
I'm running a Plum Crazy poly lower on my 7.62x39 upper, had it about 6 months and so far no issues. Trigger feel is good, actually a little crisper than my RRA single stages. I've had no issues igniting hard primer surplus ammo. It also ran great on my BCM 5.56 lightweight upper which is what I originally bought it for, but decided to switch it over to the 7.62x39 upper since I shoot corrosive surplus yugo ammo thru it. As far as weight, yes, it's a little lighter than an aluminum receiver but not by much.
Krylancelo
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Posted: 9/5/2012 1:33:23 PM

Originally Posted By wanderson:
I'm running a Plum Crazy poly lower on my 7.62x39 upper, had it about 6 months and so far no issues. Trigger feel is good, actually a little crisper than my RRA single stages. I've had no issues igniting hard primer surplus ammo. It also ran great on my BCM 5.56 lightweight upper which is what I originally bought it for, but decided to switch it over to the 7.62x39 upper since I shoot corrosive surplus yugo ammo thru it. As far as weight, yes, it's a little lighter than an aluminum receiver but not by much.

Number of rounds shot would be more useful information than the time duration you had it on there. We have no idea how any rounds or often you shoot.
jfagan601
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Posted: 9/5/2012 1:35:13 PM
NFA is good to go.I got 3 with over 10k combined through them now.NFA did a 75k round torture test with little to no breakage
wanderson
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Posted: 9/5/2012 1:50:05 PM
Number of rounds shot would be more useful information than the time duration you had it on there. We have no idea how any rounds or often you shoot.


About 300 rounds on the 5.56 upper and 600 rounds on the 7.62x39 upper.
Combat_Jack
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Posted: 9/5/2012 2:13:55 PM
Plum crazy is shit. Cav lowers are clumsy but light and usually work.
The crime you see now, it's hard to even takes its measure.
jungp
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Posted: 9/5/2012 2:15:57 PM
Originally Posted By bigray1777:
I can see plastic for pistol rounds...rifle calibers no way.


Do you have any science to your claim?

I have a couple of them.
They are very nice. I would say the weak spot would be the buffer tube hole. I wouldn't buttstroke side way with one.

Having said that, I've fired 1000s rounds with both of mine.
New Frontier doesn't have nice trigger like Plum Crazy. But the stock fit is better. No rattle on the New Frontier.

les_strat
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Posted: 9/5/2012 2:36:09 PM
If you want to save on weight, keep all the metal rail crap off and run plastic furniture, and BUS, etc. But don't go plastic on her lower.
EdgecrusherXES_45
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Posted: 9/5/2012 2:53:34 PM
I suppose their is a reason that they do not build engine blocks out of plastic but they do out of Aluminum (imagine with English accent).
I was born an AR in my hands. Behind the gun I will make my final stand, and that is why they call me .... bad company I cannot deny.... Bad company till the day I die.
B44T
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Posted: 9/5/2012 2:53:54 PM
The now discontinued Cav Arms lowers are the only ones that are good to go in my limited experience with poly lowers.

Search the threads here and the web.

FWIW I think poly is the wave of the future, Remington's Nylon 66 and Cav Arms have proven it do-able, but it will take market demand and market success to make it the mainstay.

You can watch the EE for a Cav Arms but the guys who have them tend to hang onto them.
OlCrow
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Posted: 9/5/2012 3:13:11 PM
I guess the reason for the infatuation with light weight is due to so many today have only lifted a game controller during their youth.

I grew up on a farm working hard every day so an aluminum AR isn't too heavy even for a 57 year old like me.
-Proud Supporter- Wounded Warrior Project

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