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04-15-2011, 06:11 AM
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#1
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Feedback Score: 0 reviews
Join Date: Jan 2009
Location: Las Cruces
Posts: 422
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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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''Sometimes it is entirely appropriate to kill a fly with a sledge hammer''
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04-15-2011, 06:24 AM
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#2
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Feedback Score: 0 reviews
Join Date: Apr 2011
Location: Ashland,Ky
Posts: 18
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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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04-15-2011, 07:34 AM
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#3
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I'm always 10-8
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Join Date: Jan 2009
Location: 150 miles NE of Sloppy Joe's Bar
Posts: 21,940
Liked 1311 Times on 770 Posts
Likes Given: 1276
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I wouldn't touch one with JD's paws!
Split Lower
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Get her dirty, then clean her so she starts to respect you. When her trust is complete, she will serve you well for a lifetime!
"...if doves shot back, there wouldn't be a need for a bag limit." - orangello
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04-15-2011, 10:58 AM
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#4
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Join Date: Mar 2009
Location: Steep Falls,Maine
Posts: 1,202
Liked 18 Times on 18 Posts
Likes Given: 36
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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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Originally Posted by JonM
Just because someone say brand x is the bee's knee's does NOT mean brand y is total crap.
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04-15-2011, 01:10 PM
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#5
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Moderator
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Join Date: Nov 2009
Location: Rochester WI,Rochester WI
Posts: 12,612
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Likes Given: 87
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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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"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
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04-15-2011, 01:57 PM
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#6
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Join Date: Jun 2009
Location: Tornado "Just Blow Me" Alley,Oklahoma U.S.A.
Posts: 8,424
Liked 21 Times on 16 Posts
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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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Jack
ΜΟΛΩΝ ΛΑΒΕ!
"There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter." - Hemingway
“The greatest ignorance is to reject something you know nothing about.”
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04-15-2011, 02:05 PM
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#7
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Feedback Score: 0 reviews
Join Date: Apr 2010
Location: Northwest USA
Posts: 5,388
Liked 307 Times on 263 Posts
Likes Given: 294
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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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The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
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US Army 1966-69, VFW Life Member, Retired Geek
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04-15-2011, 02:58 PM
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#8
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Feedback Score: 0 reviews
Join Date: Jul 2010
Location: Wichita,Kansas
Posts: 4,026
Liked 5 Times on 5 Posts
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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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04-15-2011, 09:00 PM
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#9
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Feedback Score: 0 reviews
Join Date: Aug 2009
Location: Somewhere in,Vermont
Posts: 122
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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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"In Vermont authenticity is all, they do not try to keep it real, they are real."- NY Times.
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04-15-2011, 09:08 PM
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#10
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Feedback Score: 0 reviews
Join Date: Oct 2007
Location: Newport,Vermont
Posts: 1,110
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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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