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10 comments

Date Votes
  • burpfire
    why would you? what are you saving 40 to 50 dollars. ever see a aluminum lower wear out? now, how long do you think a polymer is going to last? skip them. i played with one of the plum crazy polymer lowers with polymer internals, all i can say is wow. i wouldnt use them for anything but a 22.
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  • mauser54
    Save your money and buy an aluminum lower. I built 2 lowers using the Frontier Armory poly lowers. All the parts are poly, including the trigger and hammer, etc... Immediately I had problems with the takedown pins. The spring and plunger that rides in the takedown pins rode real rough and wasn't long that the rear takedown pin was worn out. Also took the original A2 pistol grip off to install an aftermarket grip. The bolt holding the grips on is steel. It stripped the threads that the bolt threads into holding the grip on.
    I ended up selling both the poly lowers. And went back to the aluminum lowers.
    It don't matter what brand of poly lower you get, they are junk.!
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  • Mobuck
    And you guys think these things don't happen to aluminum lowers???????????????????????????
    I sold a PC lower based carbine to a guy who could destroy an anvil in a sandpile and he's not had a single complaint. Currently have 4 similar carbines on the shelf and just gifted one to my older Son. During test firing and scope sightin, we got under 3/4" groups and 3 shots @ 300 meters gave a 3-4" group.
    Would I use one in a combat scenario? Well, that's why they're on my shelf and if it comes to that, I'll put them to work. The only caveat I have is I'm laying aside some takeoff FCG parts since I just don't fully trust the polymer FCG even though I've not seen a problem.
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  • 1sgret
    I know nothing about the polmer lowers, but I do remember when Glock first came out with their "plastic" frame. Every authority known to man claimed they were junk and would fail when your life depended on it.

    Time will tell.
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  • geeguy
    I make polymer parts for guns as well as automotive, industrial, etc.
    Like wood and metal, some good some bad, there are polymers that are stronger and will last longer then metal, and some are just junk black plastic. Since most of the distributors do not know "what" the part is made from it is difficult to group all polymers together.

    Your best bet is to listen to the guys on the forum that have actual experience with that specific part, instead of a general "polymer" answer. Even as a molder I get "bit" on a few plastic parts now and then, but it's happened with wood and quite a bit lately with metal parts (some real metal junk out there).

    Good luck
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  • masterbob
    I have 2 plum crazy lowered ar's. 1 has well over 10,000 rnds through it. I abuse this gun, hardly ever clean it, loan it to friends, it lives in my truck year around, I have never had a problem with it. This is why I have another.
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  • cletus85
    I have a New Frontier lower and so far I'm extremely happy with it. It has a much better than typical AR trigger and fits tight to about any upper. Cosmetically speaking, it doesn't "jump out" as being polymer.

    I bought one because at the price, there really isn't much to lose and I wanted to put together a little carbine for predator calling.
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  • cpermd
    An AR lower is a non stressed part.
    Use them to save weight
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  • ridewot
    guess ill try one[:)]
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  • shilowar
    I've had a Bushmaster Carbon 15 for 8 years or so and it has been a great rifle. requires zero lubrication even during heavy use, its been through two UPR schools and ran flawlessly. They are light, and mine is my favorite AR of the 7 I've owned and the 3 I currently have. I've run atleast 6-7k rounds through it.
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