Polymer AR-15 lowers
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Old 04-15-2011, 07:11 AM   #1
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Default Polymer AR-15 lowers

What have you heard about them? Good? Bad?

Someone at the range had one on his set up. I'm thinking of purchasing one for my next build. I wanna make it ultra lightweight.

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Old 04-15-2011, 07:24 AM   #2
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Had a very early one, didn't like it much. kept finding shavings of plastic and it felt....wierd. traded it for another weapon.

have heard they have improved a lot since then.

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Old 04-15-2011, 08:34 AM   #3
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I wouldn't touch one with JD's paws!

Split Lower



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Old 04-15-2011, 11:58 AM   #4
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If it were me I would shave weight off some place else. I think if you were to hold both stripped lowers in each hand they couldnt be more than a few oz off. Each time I get a lower it feels like an empty box

Things like a lighter barrel or maybe a lightweight upper would probably be more effective

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Old 04-15-2011, 02:10 PM   #5
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When it comes to polymer in rifle recievers not no but hell no.

In the ar15 lower the stress point is the hammer pin hole the area at the front takedown and the area at the rear takedown. Those are not reinforced in polymer ar15 recievers. It doewnt take much since the stress isn't that much but polymer doesn't haver the shearing strength that aluminum does.

Over time you will end up with pin holes that become torn or tears near the takedown pins.

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Old 04-15-2011, 02:57 PM   #6
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Best use of a polymer AR-15 lower. Although the upper is a bit pricey.

The TAC-15 AR Crossbow

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Old 04-15-2011, 03:05 PM   #7
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My buddy has a Carbon15 and it's been ok. The receiver probably will hold up for years if you shoot little and baby it. I can see wear on the upper where the charging handle catches so he really babys that now. The pin holes seem ok but that's also what I'd worry about.

And don't ever mortar the rifle to free a stuck case, there've been lots of pictures of broken lowers right at the receiver extension area.

I'd get standard 7075T6 myself.

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Old 04-15-2011, 03:58 PM   #8
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If I was going to do a non forged lower it would be a Cav Arms. Ive been wrestling w/ wanting one for almost a year now. as soon as I have the money and BCM has a LW upper in stock Ill purchase one.

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Old 04-15-2011, 10:00 PM   #9
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I have been thinking about one for a .22lr dedicated upper. for anything more than that its really not an option for me.

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Old 04-15-2011, 10:08 PM   #10
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Had a Cav Arms lower. Put about a two thousand rounds through it with no problems. Only draw back was the pivot are specialized (longer with detents built in) so Mil Spec won't work. Only real benefit I saw was reduced weight.

http://www.firearmstalk.com/forums/f20/pieces-parts-12157/

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