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Trying to make a silk purse out of a sow's ear?

Discussion in 'Black Rifle Forum' started by Cobra6, Jan 29, 2010.

  1. Cobra6

    Cobra6

    800
    0
    Jan 20, 2009
    Tennessee Valley
    I need some advice
    I bought this Sabre Defence lower -
    http://www.pistolandpawn.com/store/...id=302&zenid=b03bcbae9833468bd04325262e96cbed

    and I have a DD LPK and the Mil-Spec MOE Stock, MOE grip, MOE Trigger Guard, and Mil-Spec buffer tube assembly.

    I now see this -
    http://spreadsheets.google.com/pub?key=pwswheghNQsEuEhjFwPrgTA&gid=0

    and see that the lower receiver is not up to snuff - (note the receiver extension diameter and the carbine buffer)

    I was going to get a BCM upper with a 16" barrel and a mid-length gas system -

    Do I need to get a different lower for this? It is easier to change now, and I still have a lower that I could use for a different build.

    Thanks for any advice - I want to do a decent build with quality parts.
     
  2. NeverMore1701

    NeverMore1701 Fear no Evil Platinum Member

    38,382
    3,706
    Jun 25, 2004
    Amarillo, Tx
    Ok, that chart really only covers complete rifles. The above parts are good to go. Keep on with your plan, and you'll have a great rifle.
     


  3. MattS67

    MattS67

    317
    0
    Mar 21, 2005
    FL
    You're fine! Don't over-analyze. Just put your rifle together and enjoy it. :)
     
  4. Cobra6

    Cobra6

    800
    0
    Jan 20, 2009
    Tennessee Valley
    I have been known to over-analyze......
     
  5. javelinadave

    javelinadave Hebrew Hammer

    925
    0
    Aug 14, 2006
    Scottsdale, AZ
    Same spec as Bushmaster and Rock River. They are both quality products, you will be fine.
     
  6. RMTactical

    RMTactical www.AR15pro.net CLM

    12,603
    16
    Oct 7, 2000
    Behind an AR-15
    There is no problem here. You are good to go brother!
     
  7. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

    36,074
    441
    Nov 24, 2005
    Troy
  8. Forget "the chart" :upeyes:

    You have a fine rifle in the works.
     
  9. MADBMW

    MADBMW

    308
    0
    Dec 10, 2006
    Central, CA.
    The lower does not really mean much as long as you buy from a known company. As far as the milspec buffer tube, that is easy enough to change no problem later if you want. Same goes for swaping out the carbine buffer for an H buffer if you ever decide to. The main issue for a reliable hard use gun is going to be the bolt carrier group. HP MP tested is nice to have and a propery staked gas carrier key is a must. A BCM upper and BCM bolt carrier group will give you fine carbine.
     
  10. bdh_1

    bdh_1 Millennium Member

    310
    0
    Apr 19, 1999
    Virginia
    You just have to realize that the threads in the lower receiver have 1 3/16 - 16 thread pitch. When measuring the outside diameter of a commercial vs. a mil spec diameter receiver extension at the threads, one will find that the commercial extension is slightly different. This is due to the method of manufacture and is because the tops of the threads are knocked off flat as in "/ \" vice "/\". The difference in the threads of a commercial extension and a mil spec diameter extension simply vary in thread contact area. Either will fit a lower receiver which has 1 3/16-16 threads. The chart is based upon factory assembled M4 type rifles and has no bearing on a rifle built from parts made by various different manufacturers.
     
  11. moncoacp

    moncoacp

    983
    0
    Jan 16, 2009
    Just don't try to make a sow's ear out of a silk purse. Tried that with one of my wife's silk purses to make a Halloween costume. She was peeeeisd off.
     
  12. Looking at the Chart, the CMMG does have a properly staked gas key on the M4 carbine.
     
  13. Ruggles

    Ruggles

    10,272
    18
    Jun 13, 2005
    Tejas
    I agree the chart is mostly internet dribble IMO.
     
  14. WayaX

    WayaX Lifetime Member

    2,551
    24
    Feb 27, 2007
    this.

    When building a rifle, you choose the parts so the chart doesn't matter. The chart is accurate for full guns and I would only buy from quality manufacturers. You have done that, so just put the pieces together and you'll be fine.
     
  15. Cobra6

    Cobra6

    800
    0
    Jan 20, 2009
    Tennessee Valley
    Thanks for all the replies - I thought Sabre Defence was a quality lower
    I was probably trying to use too much info to put this together

    Now.... I just have to save up for a BCM upper assembly.
     
  16. 1811guy

    1811guy Formerly1811guy2

    3,531
    1
    May 1, 2001
    As opposed to inhalant quality?:dunno:
     
  17. javelinadave

    javelinadave Hebrew Hammer

    925
    0
    Aug 14, 2006
    Scottsdale, AZ
    BCM upper, I read on the internet that they are way out of spec!!!!!!!!!!

    Just kidding, good stuff and you should have a quality stick when you are done.
     
  18. Cobra6

    Cobra6

    800
    0
    Jan 20, 2009
    Tennessee Valley
    Ha! - LOL
    I guess I deserved that!
     
  19. Alaskapopo

    Alaskapopo NRA ENDOWMENT

    6,545
    2
    Feb 6, 2000
    Alaska
    The Chart is a great resource forget it at your own peril. However you can make a great rifle with what you have.