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AR15.COM
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4/7/2011 6:23:53 PM EDT
Hi all New here and I have a couple specific questions

I'm in love with the 5.7 round and after searching, I've decided that instead if $1200 for the fn ps90, I can get an AR and then get the 57 upper. there is a decent deal in town for a Bushmaster  carbon 15
* Barrel Length : 16
   * Caliber : .223 Rem.
   * Magazine Capacity : 30
   * Vendor Group : Bsh
   * Inventorytyp : Reg

Product Description
Description:
Carbon 15 Special
Carbon-15 upper and lower, sixteen inch lightweight barrel, telescoping stock, Bushnell red dot sight and 30 round magazine. Weighs five pounds.
price is under 700.  I just do not know if that AR lower will work with the 57 upper, and I'm looking for guidance.

TIA
4/7/2011 6:57:23 PM EDT
[#1]
If what you want is the 5.7(), why buy a complete 5.56 rifle?

Just get a complete lower half from a reputable source, then get your 5.7 upper to put on it.

Would advise staying with standard aluminum receivers.
4/7/2011 7:00:23 PM EDT
[#2]
well, I COULD spend a grand for the ar57 or 1400 for the PS90 or buy an ar and the 57 upper and have two for one.
are the carbon receivers not compatible?
4/7/2011 7:15:23 PM EDT
[#3]
Well, quick google search found the upper for $600, could get a complete lower for less than $200.  If you want a 5.56 upper later on you could certainly get one.  My advice is to avoid any variation of carbon/polymer etc "alternative" receivers, at least while you're starting out.  Not a good general purpose choice IMO.

Or just get a 5.56 now, then get that neat little Kel-Tec .22WMR carbine when it comes out.
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