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Thread: Dedicated suppressed upper port sizing and buffering.

  1. #1
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    Dedicated suppressed upper port sizing and buffering.

    I'm going to be welding an AAC Ranger 2 onto an AR barrel. I know it's sub optimal but SBRs are simply not an option in Washington state. I have two options, a cut down Colt barrel, and a cut down 14.5" MRP barrel. Both would be approx. 10.75" long.

    I'm assuming I don't need to modify the port in either. What buffer do I need? H3? I doubt I need an X as Colt and SAW open the ports in their dedicated suppressed rigs, or so I hear.

    Has anyone here gone this route before me?

  2. #2
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    DO NOT DO THIS. I CANNOT EMPHASIS THIS ENOUGH. Stay with a 16" barrel.

    I assume that you also realize that it is still unlawful to discharge a round through a suppressor in state?

    You don't need an SBR. I lived in Washington State and was able to make my 16" carbine work just fine.

    You may well need to modify the port and whoever does the work should you decide to do it anyways, make sure that they are competent.

    Quote Originally Posted by RyanB View Post
    I'm going to be welding an AAC Ranger 2 onto an AR barrel. I know it's sub optimal but SBRs are simply not an option in Washington state. I have two options, a cut down Colt barrel, and a cut down 14.5" MRP barrel. Both would be approx. 10.75" long.

    I'm assuming I don't need to modify the port in either. What buffer do I need? H3? I doubt I need an X as Colt and SAW open the ports in their dedicated suppressed rigs, or so I hear.

    Has anyone here gone this route before me?



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  3. #3
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    I expect that law to change, but I'm unconcerned if it doesn't. I rarely shoot in public.

  4. #4
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    That was a side point. The reasons for not doing so should be rather clear. I suspect you will do it anyways.

    All I can do is reiterate not to do it. The rest is up to you.

    Quote Originally Posted by RyanB View Post
    I expect that law to change, but I'm unconcerned if it doesn't. I rarely shoot in public.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  5. #5
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    I have plenty of 16" barrels. I have a Surefire for them. I know I don't need an SBR but I like them. Rainier Arms will do the work I just need to find out the porting and buffer requirements.

  6. #6
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    On a suppressed gun you need to make the port smaller. Not bigger.

    ETA: You live in WA, I won't give advice past that until the laws change.
    Last edited by Magic_Salad0892; 03-19-11 at 21:37.
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  7. #7
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    That's why I'm getting a longer barrel and cutting it back. Smaller port. Why not give advice it's a legal weapon and I already own three cans...

  8. #8
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    i've heard of people doing this. as to whether or not its a good idea... sounds like you already have a little bit of a collection and the money to blow, so why not?

    as to gas port size- there's no standard for such a thing, but i would go with .062" and be prepared to adjust your buffer weight. with that as your port size, you may or may not need a heavier buffer.. could be an H buffer will be the most reliable.. you'll just have to trial and error it.

    what perming method are you thinking about? i'd probably pin/tig it, myself.. seems to be the least destructive method for the barrel, to get off.. and since suppressors typically dont last as long as barrels, you might be replacing it at some point down the road. no sense in having to buy a new barrel too.

  9. #9
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    I will be using an AAC Ranger 2 and expect it to outlast at least one barrel, but this would be a house gun not a training gun so if it gets 500 rounds a year I will be surprised. I'm not sure if it can be pinned, I suspect welding is the way to go. My preference would be to do like what Grant does with a .060 port and Surefire can, save me the dedicated can.

    Since it will be welded, I need to figure out the port sizing first, then the buffers I can play with.

  10. #10
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    indeed... i guess you cant pin that one.

    im not aware of any manfer that makes a barrel with a port smaller than .062, though some measure a thou or two smaller.

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