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Changing to a Single Rail gas block

Discussion in 'Black Rifle Forum' started by wdphillips, Nov 29, 2011.

  1. I recently acquired a DPMS sweet 16 upper with a stainless bull barrel in .223. From the factory this is set up for a scope. I would like to change out the .936 smooth factory gas block with a single Picatinny rail gas block.

    My goal is to add a Magpul MBUS front and rear sight on the Picatinny rail system. This will give me time to use the upper while I find the right optic system.

    Any suggestions/experience on the single rail gas block?
     
  2. MrMurphy

    MrMurphy ********* Moderator Moderator Millennium Member Lifetime Member

    12,972
    2
    Jan 16, 2001
    Buried in the X-files
    The MBUS is not rated for a gas block rail, it's plastic and the heat coming off it will cause unpleasant things to happen. It's meant for free-float rail systems.

    I've never seen any gas block (railed) which actually was the right height.....they're ALL different. Finding a front that will work for you can be interesting. Get a lowpro gas block, a proper-length rail like a Troy or DD Omega, install MBUS, shoot.
     


  3. WoodenPlank

    WoodenPlank Who?

    7,958
    3
    May 15, 2010
    NW Florida
    I know someone out there makes a proper-height railed gas block, I just cannot remember for the life of me who it was. I have seen them on finished custom guns, just not sure who made the block.


    Otherwise, OP, Murph is right about using MBUS on a railed gas block. If your "smooth" gas block isn't low enough to go under a rail, swap for one that is and get a rail system. If you don't want side rails and such (or only need minimal ones) the VTAC rail from Troy is a steal for ~$200, depending on the length you want/need.
     
  4. Last edited: Dec 1, 2011
  5. WoodenPlank

    WoodenPlank Who?

    7,958
    3
    May 15, 2010
    NW Florida
    I believe that's exactly what he is suggesting. A longer free-float tube with built in rail that covers the existing gas block and gives you a mounting point for your front sight.
     
  6. ScrappyDoo

    ScrappyDoo Tacticool brah!

    1,589
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    Jan 16, 2010
    Just curious. I've read countless ppl say that the Magpul MBUS won't hold up on the gas block , it'll melt etc not to use it.

    I also read a very well written blurb once that its simply a disclaimer from Magpul so they are proactively announcing they won't replace the front site IM THE EVENT it was damaged but it actually hasn't / doesn't happen or is in fact increidbly rare.

    So I am wondering - does anyone actually have proof it won't hold up or is this just an often repeated claim? As I said the thing I read made excellent sense and was not a high school air softer type of article , it was really well written and mde a lot of sense. And also it made me think, some of those iron sights from big names are $300 for front flip BUIS. it would actually take a couple-a-few front MBUS's purchased before I reached the level on one of those expensive ones.

    And I don't mean to call you out Mr Murph or anyone else like you're wrong I am honestyly just real curious if anyone actually has melted their front MBUS o. The gas block or if it's just a theory claim etc
     
  7. WoodenPlank

    WoodenPlank Who?

    7,958
    3
    May 15, 2010
    NW Florida
    Plastic contacting hot metal directly just seems like a bad idea to me. Plus, most railed gas blocks are not the correct height to work with the MBUS.

    What front folding sights are you looking at for $300. Even Troy sights are just over $100 for a standard front sight.
     
  8. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

    36,076
    442
    Nov 24, 2005
    Troy
    Scrappy'.......do some research! As per the manufacture's Specs:




    http://store.magpul.com/product/MAG245/44
     
  9. ScrappyDoo

    ScrappyDoo Tacticool brah!

    1,589
    0
    Jan 16, 2010
    Uh , did you miss the part I typed about Magpul's disclaimer saying they wouldn't replace it if it failed? do some reading comprehension !
     
  10. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

    36,076
    442
    Nov 24, 2005
    Troy
    Go back and comprehend what you typed!
    You stated some BS about a BLURB and some he said she said bullcrap!
    Get you crap straight,.....and you MAY look like you know what you are talking about! :rofl:
     
  11. ScrappyDoo

    ScrappyDoo Tacticool brah!

    1,589
    0
    Jan 16, 2010
    Simple question. Has anyone actually had it happen. Why are you commenting on something you can't speak of , and trying to look cool making a fight ? I mean really why bother if you haven't anything productive to add. And you wonder why people ah never mind.
     
  12. BBJones

    BBJones

    1,173
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    Mar 2, 2010
    Are you the type to lick a flag pole when its frozen just because you have never seen anyone stick their tongue to one before?

    If you want to test it, find out how hot a gas block gets after 100 rounds fired in a decently quick pace. Then set your oven to that temp and throw your mapul sights in the oven. see how they do after 2-3 mins. Then repeat 10 times.

    tip: just use a magpul xtm rail cover if you want to save money.
     
  13. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

    36,076
    442
    Nov 24, 2005
    Troy

    I've never seen it first hand,.....however, I am smart enough to read directions
    and understand that when a manufacturer states,
    "NOTE: Cannot be mounted to a railed gas block due to excess heat issues."
    I am smart enough to realize that the polymer part must degrade, distort or deform
    from the heat!

    What's your excuse,.........?
     
  14. crazymoose

    crazymoose Nonentity

    4,440
    56
    Feb 9, 2005
    I suppose it depends on rate of fire. Slow fire and the MBUS will probably be fine. However, I've seen guys light cigarettes off of rifle barrels after rapid fire mag dumps, and the gas block is going to be just as hot. Also, given that you can get normal M4 handguards hot enough to melt, and they're not directly attached to the barrel, it's not hard to extrapolate.
     
  15. MrMurphy

    MrMurphy ********* Moderator Moderator Millennium Member Lifetime Member

    12,972
    2
    Jan 16, 2001
    Buried in the X-files
    When a personal friend, head of their production division says "don't stick one on a gas block" I would say he does, in fact, have a clue.