AR15.Com Archives
 Aluminum VS Polymer
Impala  [Member]
6/10/2010 4:37:50 AM EST
Hi you all,

I've been reading a fair amount of postings regarding polymer AR-15 lowers compared to the old fashioned aluminum versions. What's your opinion of the polymers in general? Some people consider then to be unsafe. WHY? or is it just a ploy to get people to buy more aluminum lowers??

Impala
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goldeyeslayer  [Team Member]
6/10/2010 4:46:47 AM EST
By "polymer" what do you mean? Carbon 15 or Cav Arms?
ShOcKeRpb  [Member]
6/10/2010 5:07:51 AM EST
Poly lowers CAN be good. The only one that I have heard of that has made a quality polymer lower is Cav Arms, and you will notice, they use an integrated stock and buffer tube. Plum Crazy Firearms has made a poly lower using a seperate buffer tube that seem to be holding up, but I haven't heard too much about them. Then you have the polymer lowers,and entire firearms, that are comlete junk, Hesse/Vulcan/Blackthorne/Velocity come to mind. Soon down the road, I will invest in a poly lower, but it will be from Cav Arms.

E.T.A. I did some checking on the Bushmaster Carbon 15 line, and while its not an "all polymer" lower, they do seem to hold up pretty well. I, personally, would still go with Cav Arms lower.
boaman88  [Member]
6/10/2010 5:12:08 AM EST
Kind of surprised Magpul has not come up with one. They have already done quite a bit with plastics and the Bushmaster ACR they designed uses a synthetic lower. Would be a top seller for sure.
goldeyeslayer  [Team Member]
6/10/2010 5:17:24 AM EST
Originally Posted By ShOcKeRpb:
Poly lowers CAN be good. The only one that I have heard of that has made a quality polymer lower is Cav Arms, and you will notice, they use an integrated stock and buffer tube. Plum Crazy Firearms has made a poly lower using a seperate buffer tube that seem to be holding up, but I haven't heard too much about them. Then you have the polymer lowers,and entire firearms, that are comlete junk, Hesse/Vulcan/Blackthorne/Velocity come to mind. Soon down the road, I will invest in a poly lower, but it will be from Cav Arms.

E.T.A. I did some checking on the Bushmaster Carbon 15 line, and while its not an "all polymer" lower, they do seem to hold up pretty well. I, personally, would still go with Cav Arms lower.



do some more checking on the Carbon 15.....they weren't holding up that well. And unless something has changed I don't think you'll be going with a Cav Arms unless its used
Impala  [Member]
6/10/2010 5:21:39 AM EST
Hi you all,

Thanks for responding so quickly! I was refering to the newly seen Plum Crazy lowers. Cav Arms has seized making them according to their website so no chance for that

I was intersted in the Plum Crazy lower cuz of the prices is so low and with in my pocket book right now but my place is already out so I'm outta luck.

Impala
j_king  [Member]
6/10/2010 5:47:27 AM EST
Originally Posted By goldeyeslayer:
Originally Posted By ShOcKeRpb:
Poly lowers CAN be good. The only one that I have heard of that has made a quality polymer lower is Cav Arms, and you will notice, they use an integrated stock and buffer tube. Plum Crazy Firearms has made a poly lower using a seperate buffer tube that seem to be holding up, but I haven't heard too much about them. Then you have the polymer lowers,and entire firearms, that are comlete junk, Hesse/Vulcan/Blackthorne/Velocity come to mind. Soon down the road, I will invest in a poly lower, but it will be from Cav Arms.

E.T.A. I did some checking on the Bushmaster Carbon 15 line, and while its not an "all polymer" lower, they do seem to hold up pretty well. I, personally, would still go with Cav Arms lower.



do some more checking on the Carbon 15.....they weren't holding up that well. And unless something has changed I don't think you'll be going with a Cav Arms unless its used


Plenty of retailers still sell new CavArms lowers. DSarms is the first that comes to mind.
goldeyeslayer  [Team Member]
6/10/2010 5:50:19 AM EST
Originally Posted By j_king:
Originally Posted By goldeyeslayer:
Originally Posted By ShOcKeRpb:
Poly lowers CAN be good. The only one that I have heard of that has made a quality polymer lower is Cav Arms, and you will notice, they use an integrated stock and buffer tube. Plum Crazy Firearms has made a poly lower using a seperate buffer tube that seem to be holding up, but I haven't heard too much about them. Then you have the polymer lowers,and entire firearms, that are comlete junk, Hesse/Vulcan/Blackthorne/Velocity come to mind. Soon down the road, I will invest in a poly lower, but it will be from Cav Arms.

E.T.A. I did some checking on the Bushmaster Carbon 15 line, and while its not an "all polymer" lower, they do seem to hold up pretty well. I, personally, would still go with Cav Arms lower.



do some more checking on the Carbon 15.....they weren't holding up that well. And unless something has changed I don't think you'll be going with a Cav Arms unless its used


Plenty of retailers still sell new CavArms lowers. DSarms is the first that comes to mind.


Dammit! That means I've gotta get my money rounded up quickly.

eta: who else?

ShOcKeRpb  [Member]
6/10/2010 6:31:27 AM EST
Originally Posted By goldeyeslayer:
Originally Posted By ShOcKeRpb:
Poly lowers CAN be good. The only one that I have heard of that has made a quality polymer lower is Cav Arms, and you will notice, they use an integrated stock and buffer tube. Plum Crazy Firearms has made a poly lower using a seperate buffer tube that seem to be holding up, but I haven't heard too much about them. Then you have the polymer lowers,and entire firearms, that are comlete junk, Hesse/Vulcan/Blackthorne/Velocity come to mind. Soon down the road, I will invest in a poly lower, but it will be from Cav Arms.

E.T.A. I did some checking on the Bushmaster Carbon 15 line, and while its not an "all polymer" lower, they do seem to hold up pretty well. I, personally, would still go with Cav Arms lower.



do some more checking on the Carbon 15.....they weren't holding up that well. And unless something has changed I don't think you'll be going with a Cav Arms unless its used


I've done a little searching on the subject, and have found that most of the problems were when it was made by Profesional Ordinance (the original designer), but Bushmaster bought the design and irond out most of the problems. I havent heard of any catastrophic failures due to the material, though I have seen one kaboom, but it doesn't look like a material falure.
BRAlaska  [Member]
6/10/2010 6:38:27 AM EST
I have had very good luck with Plum Crazy lowers. So far I've purchased 2 and will undoubtedly be getting more. A couple of things tho, Not all mags drop free and the buffer tube castle nut is not staked or locktited on the ones I have received. On the plus side the trigger pull is excellent, no creep and a glass rod like break. Also it has been reported here that the FCG pins are polymer, but on both the lowers I have they are steel.
They also fit nice and tight on every upper I've tried them on. I think for a hundred bones these are a very good value, and considering that the cav arms lowers are generally accepted and the first one of those I saw at SHOT a few years ago was a 2 piece unit that was screwed together.

A picture of one of mine at the bottom with a Cerro forge upper, Wilson 1x9 hbar and YHM ff handguard. and a all polymer S&W MP 15-22 at the top;
ricky_arthur  [Member]
6/10/2010 7:02:58 AM EST
With aero and aim selling quality lower recievers for 80$ why would you waste money on a plastic one for 100$?
plinkr415  [Team Member]
6/10/2010 7:06:01 AM EST
Originally Posted By ricky_arthur:
With aero and aim selling quality lower recievers for 80$ why would you waste money on a plastic one for 100$?

Those $80 lowers are stripped, while the polymer ones are complete for $100.
goldeyeslayer  [Team Member]
6/10/2010 7:07:03 AM EST
Originally Posted By ricky_arthur:
With aero and aim selling quality lower recievers for 80$ why would you waste money on a plastic one for 100$?


$130 for a COMPLETE lower on their site. I'm not sold yet, but that sounds like a pretty good deal for a range toy.
BRAlaska  [Member]
6/10/2010 7:14:07 AM EST
You can still get them at London Bridge Firearms in Lake Havasu, AZ for $109.99
B44T  [Team Member]
6/10/2010 9:57:11 AM EST
Polymer is still in its ascendancy as far as firearms usage goes.

Somewhere right now someone is shaking and cussing over those aluminum plastic crap guns because every one knows "real" guns are made from ordinance steel and walnut forged aluminum and fiberglass.
CJan_NH  [Team Member]
6/10/2010 10:04:24 AM EST
Originally Posted By Impala:
Hi you all,

I've been reading a fair amount of postings regarding polymer AR-15 lowers compared to the old fashioned aluminum versions. What's your opinion of the polymers in general? Some people consider then to be unsafe. WHY? or is it just a ploy to get people to buy more aluminum lowers??

Impala

Lots of valuable info in your thread from a few days ago HERE

Impala  [Member]
6/10/2010 5:48:06 PM EST
Thanks everyone I'll do some more homework before making a final decision. Your replies are always appreciated.:-)

Impala
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