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Old 09-18-2013, 06:24 PM   #1
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Default Plastic/Polymer ARs

I have been doing some research about these carbon fiber ARs. They say the polymer is 4X stronger than aluminum. There is a local gunshop near me that has a few Bushmasters for $500-$600, used, but in excellent condition. Opinions?

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Old 09-18-2013, 06:29 PM   #2
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My latest AR is polymer - it is good, no problems so far - but until I've had it for 6 or 7 years, I'm not ready to say it is just as good as aluminum.

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Old 09-18-2013, 06:59 PM   #3
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Quote:
Originally Posted by JosephMD View Post
My latest AR is polymer - it is good, no problems so far - but until I've had it for 6 or 7 years, I'm not ready to say it is just as good as aluminum.
Agree. I finished an AR build last year using a Plum Crazy (now under New Frontier Armory ..I think) as the starting point. Added a Del Ton dissipator upper, FAB Defense mag well grip... Magpul flip up sights, sling and 30 rounders... Have since added a forward grip/bipod to help balance when firing from a standing shouldered position (barrel heavy, receiver light).. over 500+ rounds and no complaints so far....
Going shooting with some buddies next weekend and will compare with Palmetto State, Olympia and an M4 by MMC and get back with you.
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Old 09-18-2013, 07:05 PM   #4
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Stay away from Vulcan. Lowest quality AR in the business.

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Old 09-18-2013, 07:29 PM   #5
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... They say the polymer is 4X stronger than aluminum...
They say? Who say?

The guys trying to sell you the Bushie?

I'd pass unless you want the absolute very least common denominator AR.
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Old 09-18-2013, 07:57 PM   #6
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They say? Who say?

The guys trying to sell you the Bushie?

I'd pass unless you want the absolute very least common denominator AR.
Scroll down and read the first sentence in the add about the AR for sale. I have come across this "4X stronger than aluminum" catch phrase when doing research on the Carbon 15's. That's why I am here asking Q?s about it so you AR owners can educate me.

http://www.armslist.com/posts/1828004/colorado-rifles-for-sale--bushmaster-ar-15-carbon-15-nib-unfired
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Old 09-18-2013, 08:00 PM   #7
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I got a couple of NFA lowers during the panic after Sandy Hook, and I cracked one putting the roll pin to the bolt catch. I took the LPK out of it and put it into the other one. I am saving it for when I decide to build a dedicated .22LR AR, because I don't trust it with anything more powerful. I had a very bad experience with a Vulcan lower years back, and decided to give NFA a try after reading some glowing reviews. Polymer is not my first choice.

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Old 09-18-2013, 08:10 PM   #8
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only in longitudinal strength. as in making a strand and pulling with it. its much weaker than aluminum in shear strength. ar15 poly lowers the walls are thin and this leads to stress cracks around the reciever extenstion and in the uppers around the barrel extension. this is where the sheer forces are the greatest and polymer is the weakest.

if your just plinking on a range it will prolly be just fine. but if your slinging it up and using it like a true rifle with a good two point sling the sheer forces will bend and flex that poly like a rubber hose. there just isnt enough material in the poly lowers to prevent flexing.

even the military demanded a reinforce lower when they went to the a2 model which was the major change. the reciever extension area was heavily reinforced to prevent flex stress cracking. poly is substantially weaker in that area.

thats why i wont use a poly lower or upper. polymer works fine if its strengths and weakness are taken into play and the gun is designed around that. you run into issues when you try and adapt a firearm to a material that is radically different.

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Old 09-18-2013, 08:11 PM   #9
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Well they are half way correct carbon fiber is 4X stronger than aluminum , however they arent making the Bushmaster Carbon 15 out of woven carbon fiber which is indeed stronger , They are making the carbon 15 out of epoxy ,carbon shreds and scraps of carbon " Carbon Composite " , none of it is woven fiber. They also laminate the top rail to the bottom rail Dont fall for the smoke and mirrors trick . If I were your dealer and I told you that I could turn a turd into a diamond would you believe that . Just saying

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Old 09-18-2013, 08:13 PM   #10
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I have a carbon 15 from bushmaster, no complaints on reliability so far but I did have to lock tight the rail on the upper receiver. The rail is only held on to the upper by a small screw and before I used lock tight on it, it would come lose all the time.

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