sig m400srp quad rail?

Discussion in 'AR-15 Discussion' started by Applin88, Feb 1, 2013.

  1. Applin88

    Applin88 New Member

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    I bought a sig and I wana put a quad rail on it but it has the gas block. I don't wana order one that want work due to the gas block getting in the way any help will be greatly appreciated
     
  2. Quentin

    Quentin New Member

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    You have a standard FSB? And want to keep it? Do you have carbine length gas with standard 7" handguards? If so 7" two-piece drop on rails should work but be careful that SIG truly is standard length and uses a standard delta ring and end cap mount.

    If you want to replace the FSB there is more to deal with.
     

  3. Applin88

    Applin88 New Member

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    No fsb just a flat top carbine optics ready
     
  4. AgentTikki

    AgentTikki New Member

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    pron please.

    visuals help us fap faster........
     
  5. AgentTikki

    AgentTikki New Member

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    nvm googled it

    nice stick gratz!

    option 1
    replace the gasblock with a low profile unit and free float a rail or handguard over it.

    option 2
    what Q said.
     
  6. Applin88

    Applin88 New Member

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    How hard is it to replace the gas block
     
  7. Applin88

    Applin88 New Member

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    The gas block is pressed on and has two locking pins
     
  8. Quentin

    Quentin New Member

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    Pins or set screws? If pins, they must be driven out (watch out for tapered pins).
     
  9. Applin88

    Applin88 New Member

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    Pins. I pulled the stock handguards off and measured them they are 6 5/8'' long I've found 6 7/8'' 7'' and 7.2'' not 6 5/8''