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Posted: 4/26/2013 8:11:01 AM EST
Are they worth a damn or not? no experience with them whatsoever. everything i have ever shot has been metal. May make a trade depending on your answers!
Link Posted: 4/26/2013 8:11:43 AM EST
[Last Edit: 4/26/2013 8:12:49 AM EST by Fullpower]
Originally Posted By gregk135:
Are they worth a damn or not? no experience with them whatsoever. everything i have ever shot has been metal. May make a trade depending on your answers!


Nope. I wouldnt touch one
( Only exception: if I was building a dedicated .22LR, and it was FREE, a poly/carbon lower might be accdeptable )
Link Posted: 4/26/2013 8:13:54 AM EST
for a non self defense gun... they are fine... no they will not be the end all to end all...but for a fun light weight hiking rifle they can not be beat.
Link Posted: 4/26/2013 8:16:21 AM EST
I have three. two are just on a shelf. one I put on my wife's 22lr AR.

They seem well made. ATI brand.

As said above. For an AR I would use for defense I would use metal. But for a 22 or a range gun, it seems fine.
Link Posted: 4/26/2013 8:19:14 AM EST
Had a few, no problems with them. Currently have one that also has a poly upper as a dedicated 22 LR gun. Lightweight and no problem. Most folks aren't going to use and abuse their guns enough to be able to tell. Totally up to the individual as to whether or not think it's okay. It's a lot like the difference between forged and cast lowers to me. To each their own.
Link Posted: 4/26/2013 8:21:56 AM EST
Unless it's a CAV-15 from Cavalry Arms, GWACS, or Sabre, do not buy it.

The CAV-15 was modified to reinforce key areas to increase durability. They work fine with "normal" parts.
Link Posted: 4/26/2013 8:22:06 AM EST
My experience has only been with the Carbon-15 pistol... A buddy bought one that has been nothing but trouble. Parts breakages repeatedly in the bolt / carrier group (most likely caused by the odd recoil buffer setup).
The upper and lower seem to be holding up ok, but given an option, I'll stick with aluminum.
Link Posted: 4/26/2013 8:25:57 AM EST
Well just by the 50/50 split in here I think I'm gonna pass. I don't need a 50/50 rifle!
Link Posted: 4/26/2013 8:29:27 AM EST
at one point it was a cheap readily available alternative.

you could get a complete lower with buttstock assembly and fcg for $99

the one I have hasn't given me any problems and is a nice lightweight gun.

There is really no reason to go poly now the prices went up...
Link Posted: 4/26/2013 8:31:00 AM EST
I've currently got a New Frontier Armory lower and have had no problems. When assembling I had to sand a few spots in order for things to fit better but that's no big deal to me. It is extremely lightweight and well built IMO. Is it a combat ready rifle? Absolutely not. But for home defense and plinking at the range, it holds up just as well as an Aluminum lower.
Link Posted: 4/26/2013 8:31:45 AM EST
I noticed that Windham Weaponry introduced a carbonfiber/polymer lower. Not sure how it performs though.
Link Posted: 4/26/2013 8:32:17 AM EST
I have 6 stripped ones in the safe...Never know when someone will get desperate stupid...
Link Posted: 4/26/2013 8:55:14 AM EST


I have a poly lower that I built a .22 on. And that's because I'm uncertain if it will hold up to 556 after a while.

It's one of those plum crazy lowers.

Link Posted: 4/26/2013 9:02:48 AM EST
[Last Edit: 4/26/2013 9:05:43 AM EST by _DR]
Link Posted: 4/26/2013 9:10:32 AM EST




Link Posted: 4/26/2013 9:12:21 AM EST
[Last Edit: 4/26/2013 9:13:29 AM EST by _DR]


Link Posted: 4/26/2013 9:18:14 AM EST
Link Posted: 4/26/2013 9:18:57 AM EST
Link Posted: 4/26/2013 9:21:39 AM EST
[Last Edit: 4/26/2013 9:22:24 AM EST by _DR]
Originally Posted By scsep178:
But for home defense and plinking at the range, it holds up just as well as an Aluminum lower.



mmmkay.
Link Posted: 4/26/2013 9:23:49 AM EST
I have used one on a .50 Beowulf for almost 2 years now without issue.
Link Posted: 4/26/2013 9:24:16 AM EST
[Last Edit: 4/26/2013 9:24:29 AM EST by bg10]


Link Posted: 4/26/2013 9:27:30 AM EST
Unless it has been redesigned around the new material it is junk.

Aluminum design with polymer is like building a steel bridge from balsa wood and expecting it to work.
Link Posted: 4/26/2013 9:28:12 AM EST
I was more than happy with the two CavArm lowers is used.
Link Posted: 4/26/2013 9:38:16 AM EST
I'm planning on buying one to free up an aluminum lower that is presently on my dedicated .22LR AR.
I figure that it should last forever (or at least a long long time) on the .22LR.
Link Posted: 4/26/2013 9:38:32 AM EST
Originally Posted By TontoGoldstein:
I was more than happy with the two CavArm lowers is used.


I have one of the GWACS lowers that are made using the CAV Arms technique and molds.

They are not in the same league as the current crop of weak polymer lowers.

The original CAV-15, and the GWACS CAV15 mk II have much thicker walls and the integral construction makes them stronger. Failures are relatively rare.


It is the only AR15 polymer lower I would own. I still prefer forged aluminum, but if you wanted polymer in an AR15 lower, this would be the way to go.
Link Posted: 4/26/2013 9:39:35 AM EST
I would have one on a dedicated 22LR but that's about it.
Link Posted: 4/26/2013 9:42:10 AM EST
Originally Posted By gregk135:
Are they worth a damn or not? no experience with them whatsoever. everything i have ever shot has been metal. May make a trade depending on your answers!


Are you looking at one for about $90 on a 4x4 forum? Just curious. Saw an ad on a local forum and thought about it for about 2 seconds and thought better of it due to pics like the ones below.
Link Posted: 4/26/2013 9:42:19 AM EST
[Last Edit: 4/26/2013 9:44:03 AM EST by _DR]
Originally Posted By AZ_Sky:
I'm planning on buying one to free up an aluminum lower that is presently on my dedicated .22LR AR.
I figure that it should last forever (or at least a long long time) on the .22LR.


For firing, sure. However you still have to be careful how much stress and torque you put on the buttstock/receiver extension. This is a weak point for the polymer because of lower strength of materials, made of the same shape and design as stronger forged aluminum. I would not use the rifle in tactical drills where you place the buttstock on the ground to break the fall to your knees for example, like you can do with a forged lower built rifle.

In my opinion they are not worth spending any money on.
Link Posted: 4/26/2013 9:42:39 AM EST
Link Posted: 4/26/2013 9:44:52 AM EST
Originally Posted By iNuhBaDNayburhood:
I used to LOVE them for lightweight builds - until I learned how they become brittle & break in cold weather!

Mine fell about 3.5 feet off the icy trunk of my Camry and hit the concrete garage floor when the buffer tube separated from the lower receiver.

Won't waste money on anything like my plum crazy again.


Yeah temperature extremes are a whole different consideration, so are chemicals that can degrade polymer.
Link Posted: 4/26/2013 12:50:23 PM EST
Why am I not surprised that one of the broken ones says Vulcan on it


Link Posted: 4/26/2013 12:59:42 PM EST
I have one.... 2000 rounds down and its still fine. even have a poly Hammer and works great.
Link Posted: 4/26/2013 1:26:49 PM EST
why.....
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