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Form 1 Sig MPX

Discussion in 'NFA Firearms and Accessories' started by Madcap_Magician, Feb 6, 2019.

  1. Madcap_Magician

    Madcap_Magician Member

    Joined:
    Apr 8, 2009
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    MN
    Yeah, that's why I bought the pistol and went with the Form 1 path instead of just buying a factory SBR and transferring by Form 4. I'm hoping that e-File Form 4 is active by the time I have the money to buy the shorter barrel and a suppressor.
     
    MCMXI likes this.
  2. Madcap_Magician

    Madcap_Magician Member

    Joined:
    Apr 8, 2009
    Messages:
    2,066
    Location:
    MN
    I have only shot a 9mm Colt SMG and the MPX, but the Colt had an oddly sharp and unpleasant recoil impulse to me. It wasn't powerful recoil... but it was kind of a sharp, swift jab to the shoulder, if that makes sense. A better recoil pad than the base M4 stock would probably have helped.

    But the MPX has basically zero recoil to me. It's like shooting a rimfire rifle and easier than shooting a 5.56mm M4, which is of course itself practically recoilless.

    I've heard a lot about the Scorpion being the best for suppression, but I may never get around to suppressing my MPX, so I'm OK with it the way it is with the better shootability getting the nod for me over potentially better and less gassy sound suppression in the future.
     
  3. Gtscotty

    Gtscotty Member

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    Jul 2, 2007
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    2,989
    Location:
    Wyoming
    Did you buy the barrel and BCG kit? I've really been wanting one of their delayed blowback setups for a suppressor host, but assumed they didn't sell the special bolts and barrels separate. I didn't think to look on their site until I read your post, now I need one.

    How does yours work?
     
  4. greyling22

    greyling22 Member

    Joined:
    Aug 6, 2007
    Messages:
    5,125
    Location:
    East Texas
    I did. 8" kit from opticsplanet. https://www.opticsplanet.com/cmmg-inc-mkg-guard-9mm-barrel-and-bolt-carrier-group-kit.html it was roughly 350 after the 10% off code. though I see they are now OOS.

    I added a cheap ebay handguard and I'm running it on an sbr lower using the endomags from mean arms. https://www.meanarms.com/products/detail/endomag-9mm
    it works great. I did have to modify the endomags to fit the guard bolt since I bought them from aimsurplus, along with my upper https://aimsurplus.com/anderson-manufacturing-lightweight-sport-ar-upper-receiver again, now OOS, and if you decide to go that route, I have some pictures posted here https://imgur.com/a/1M8rsJE and as far as I can tell, those are the only pictures on the internet showing you how to mod your endomags.
     
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