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AR10 variant difference

Discussion in 'Rifle Country' started by freakshow10mm, Jul 14, 2009.

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  1. freakshow10mm

    freakshow10mm member

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    Thinking about building a .308 caliber AR style rifle.

    I've heard there is a difference between the DPMS and Armalite stype uppers and lowers. What are the differences and how do they have an overall effect on the performance of the weapon? I was thinking of using a CMMG lower. What upper would need to match it? I'm going to piece it together myself and won't be doing a "buy and upper and build the lower" deal. I'm assembling everything myself from scratch.
     
  2. alistaire

    alistaire Member

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    Armalite/eagle arms designed thier AR10 from scratch using m16 parts where practical for availability. Since this was during the AW ban, they designed a magazine derived from the M14 mag which the could remanufacture into legal pre-ban AR10 mags. The M14 mag used a slight tilt (apparently for better feeding) so Armalite's mag well is tilted.
    You should not mix Armalite uppers and lowers with DPMS/Knight's Armament etc, The Armalite website has a history section covering this.

    According to this: http://www.armalite.com/Categories.aspx?Category=376e8176-9800-47af-ad62-932357d7be9f
    LMT did most of the design work on the Armalite AR-10.

    See also:http://www.armalite.com/images/Tech Notes/TECH NOTE 71 AR-10 Magazines 090603 Rev 0 Final.pdf
     
    Last edited: Jul 14, 2009
  3. freakshow10mm

    freakshow10mm member

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    So CMMG lower means DPMS or KAC upper with DPMS mags?
     
  4. nyresq

    nyresq Member

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    yes, armalite/eagle only works with armalite/eagle... and only armalite mags or M14 mags modified with them.

    the DPMS design is compatable with the others and the DPMS mags are what everyone else uses, but some have said they done work without some modification in stoner SR-25 rifles...
     
  5. freakshow10mm

    freakshow10mm member

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    Thanks. Looks like CMMG lower with DPMS upper then whatever else I can think of wrapped around that.
     
  6. taliv

    taliv Moderator

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    good question. i was kind of wondering that myself. i have two SR-25s, but had been pondering a 260rem build out of dpms parts. definitely a back-burner project for me, but good info nonetheless
     
  7. nyresq

    nyresq Member

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    260rem is the way to go... superior balistics for paper punching, and a flatter trajectory with less recoil. whats not to like?
     
  8. freakshow10mm

    freakshow10mm member

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    Reason I'm going with a .308 is I got 400 blemished Hornady 175gr BTHP-M bullets for $75 shipped. I need something to shoot them. Thinking for an excuse to build or buy a .308 and then I can start offering .308 ammo too.
     
  9. Dr. Tad Hussein Winslow

    Dr. Tad Hussein Winslow member

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    I have had both. Armalite mags require dremeling to work in an Armalite rifle - and I mean brand new mags. DPMS don't. Get a DPMS.

    I have to agree, since my DPMS is in .260. Buuuut, I dunno if DPMS still makes them - when you click on any .260 on their website, it says page cannot be found or some such. Not so with the .338s, .243s, and 6.5 creedmoor.
     
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