Polymer AR-15 lowers

Discussion in 'AR-15 Discussion' started by indyfan, Apr 15, 2011.

  1. indyfan

    indyfan New Member

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    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.
     
  2. mausersurgeon

    mausersurgeon New Member

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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.
     

  3. canebrake

    canebrake New Member

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  4. ktmboyz

    ktmboyz New Member

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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 :eek:

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

    JonM Moderator

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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.
     
  6. IGETEVEN

    IGETEVEN New Member

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    Best use of a polymer AR-15 lower. Although the upper is a bit pricey. :(

    The TAC-15 AR Crossbow

    [​IMG]
     
  7. Quentin

    Quentin New Member

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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.
     
  8. mjkeat

    mjkeat New Member

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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.
     
  9. PTsouthpaw

    PTsouthpaw New Member

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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.
     
  10. jeepcreep927

    jeepcreep927 New Member

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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/
     
  11. Tommy34

    Tommy34 New Member

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    If thats what you want just get a cmmg bolt carrier i have one and its been pretty cool
     
  12. Shihan

    Shihan Active Member Lifetime Supporter

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    I was looking into them, then realized that the weight difference doesn't make much difference. A few ounces isn't going to affect me in anyway. It's not like I am going to be going on any 50 mile humps and the weight is going to be an issue.
     
  13. mausersurgeon

    mausersurgeon New Member

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    this has always kinda been a "catch 22."
    if weight is going to be an issue (i.e. humping 50 miles with a 50 pound pack), then you will probably NEED the strongest, most durable rifle parts anyway. if you don't NEED the most durable rifle parts, then you really don't NEED the very few ounces of weight it will save you.

    Standard receivers are light 'nuff and strong 'nuff. 'nuff said.
     
  14. Quentin

    Quentin New Member

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    Well said! :D

    And that's what it boils down to.