changing sbr carbine gas system to mid length handguard

Discussion in 'AR-15 Discussion' started by ChiefOswald, Jan 23, 2011.

  1. ChiefOswald

    ChiefOswald New Member

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    have a 11.5 sbr with carbine length gas system. what is the process to put a mid-length handguard on this setup without changing anything else? Free Float with a low pro gas block?
     
  2. Gatekeeper

    Gatekeeper New Member

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    Lo-pro or cut your existing FSB down to fit under the free float tube.
    [​IMG]
    I cut mine down when I placed a 13" ff tube on my 16" carbine and it works great (and was free):D
     

  3. ChiefOswald

    ChiefOswald New Member

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    Never messed with swapping handguards. How do the ff handguards attach?
     
  4. Gatekeeper

    Gatekeeper New Member

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    Her's a good video that covers basic removal and installation
    [ame=http://www.youtube.com/watch?v=rK4XzPll9U8]YouTube - installing a free float handguard[/ame]

    The barrel nut/FF handguard mount is usually a little different depending on manufacturer(follow their instructions) but the rest of the basics are the same.

    Now since you are installing a longer handguard you will have to install a lo-profile gas block or cut down your factory front sight base into a lo-pro gas block. Thats what I was referring to in my first post. Simply cut off the sight riser and reshaped it with a dremel instead of buying a low pro gas block.

    Here is a video of installing a long handguard on a 11.5 sbr. Covers what I mean by chopping the FSB
    [ame=http://www.youtube.com/watch?v=9zLL84Ryu0Y&feature=related]YouTube - AR15: Chopping a Front Sight / Gas Block Mod[/ame]

    Hope this helps
     
  5. mjkeat

    mjkeat New Member

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    Good advise.

    Cutting the FSB is the best way to go. Youll be sure to get the gas port lined up correctly. Unless you use a pinned on lo pro gas block.
     
  6. jhog

    jhog New Member

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    Gatekeeper, do you like that grip? Looks cool and thinking about getting one.
     
  7. Gatekeeper

    Gatekeeper New Member

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    Yes I do. I like it mounted on a long hand guard that allows me to shoot with my support arm extended. Shooting on the move and transitions from target to target are very fast and very stable.
    I do not like it mounted on a carbine length hand guard, the angle is just not comfortable (for me) on a short guard. i have long arms however and YMMV
    [​IMG]
     
  8. jhog

    jhog New Member

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    You convinced me now I gotta have one! LOL It will be perfect for my short arms and looks waaay mo betta than a stick hangin down under a barrel! Ha!
     
  9. ChiefOswald

    ChiefOswald New Member

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    Yes, having edm express (local metal work shop) work my a2 right down to a lopro. 11.5 " barrel would look good with a 11" handguard. Having trouble finding different companies/options. Any suggestions?
     
  10. Gatekeeper

    Gatekeeper New Member

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    May want to check out this link for 11.5" uppers. They show quite a few options in 10 and 11 inch rails. Would help give you an idea what they would look like on your 11.5"
    http://www.bravocompanyusa.com/AR-15-11-Upper-Receiver-Group-s/30.htm


    Here is the one they used in the second video link i posted
    VTAC Troy TRX Extreme Battle Rail

    This is the same model I have but in 11inch
    Troy TRX Extreme Battle Rail
    Currently out of stock at BCM. You can click on the "E-mail me when on stock" button and BCM will contact you as soon as they have it available

    or US Calvary expects them in stock on 2-11-11
    TROY™ TRX Extreme BattleRail

    Both are lightweight small diameter tubes and come with additional rail sections you can mount if you need to add an accessory
     
    Last edited: Jan 26, 2011
  11. jhog

    jhog New Member

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    Pretty cool stuff. Tell me, do you need a special permit or something to have a barrel less than 16 inchs? If so, what do you have to do to get one.
     
  12. mjkeat

    mjkeat New Member

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    You have to get a stamp. A $200 stamp that requires paperwork and a decent amount of waiting.
     
  13. mjkeat

    mjkeat New Member

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    I like the Troy EXT as well. I have three of them. I did however mount my AFG directly to the tube rather than use the rail section. The rail gets to warm to not have some sort of buffer b/w your hand and the rail.

    [​IMG]