Anyone build a dissipator style upper?

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    Anyone build a dissipator style upper?

    I have a couple lowers on the way. One has an upper ready, one doesn’t. Thinking about some form of dissipator style build. I read about some gassing issues, that could possibly be remedied by drilling the hole in the barrel slightly bigger.

    Thoughts?

    #2
    Most dissipators today are nothing but a carbine or mid-length gas system with a longer handguard and front sight post. This means they will function identically to one with a shorter handguard.

    They arent all the common since you can you can just go to a free float rail and have all the space and sight radius you want. I still like the idea for an iron sight only gun though where you want the durability of a FSB.

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      #3
      Yes, I did more reading yesterday and I should have asked about a “605” instead of a dissipator. I am curious what is involved in making a 16 inch barrel with the rifle gas system function correctly. I have some sort of a retromod type upper in my head.

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        #4
        Yeah I like the concept. I’ve thought about putting together something like this. Im just not sure why you’d mess with drilling gas ports out and decreased reliability when you could just run a 14.5” or 16” barrel with a midlength low profile gas block and then a rifle FSB and hangduard.

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          #5
          https://palmettostatearmory.com/psa-...165448215.html

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            #6
            Becuase I don’t have one yet haha. I do understand that that is what a “dissipator” was, and I was a dumb dumb for calling it that.

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              #7
              At the moment, I don’t think I can just click and buy a true dissipator barrel. Everything I found is discontinued.

              edit: I did it again! I mean a 16 inch barrel with a rifle gas system.

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                #8
                After more reading, I think I can figure this out. Looks like people drill out the gas port to .110 and call it good. However, I believe they are using rifle buffer systems, I plan to use the new ke arm mk3 lowers, carbine buffer system. Because of the different buffer system, a heavy buffer may be needed, H2 seems common. So, brownells is making 605 clones. They have complete uppers available, but they are 15.5 with pinned and welded flash hiders. They also have just the barrel assembly, with no flash hider. Faxon sells flash hiders that are.620 OD, so you can slid the front sight on/off without removing it. So that barrel, that flash hider pinned/welded, drill hole to .110 if it isn’t already. What am I missing?

                I see in my head a carry handle slick side upper, a full length free float hand guard, with a front sight blade, on the ke arms mk3 lower. Just irons, no anything else, except maybe a sling.

                Someone build this so I have something to copy.

                https://www.brownells.com/rifle-part...rod127609.aspx

                https://faxonfirearms.com/faxon-slim...le-brake-5-56/

                https://www.brownells.com/rifle-part...rod132660.aspx

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                  #9
                  I don’t see it being reliable with a variety of ammo given the super short dwell time and especially with a carbine buffer. The rifle length (and A5) buffer setups are apparently more reliable/forgiving. You can probably get it to run with with a specific load however, with some tuning, as long as it’s cleaned/lubed. I also don’t really get the point of the polymer lowers other than if weight savings is the main priority. Especially in an AR where it is “the gun” and you can’t just grab another for $30 off eBay.

                  To me, both of those things go against the concept of a KISS, iron sight AR, which would be a no-fail apocalypse weapon. I’m interested to see how it goes however, so carry on and keep up posted.

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                    #10
                    All valid points.

                    No particular reason for the polymer lowers. I ordered 2. I already have an upper for one. They are pre order only at the moment, a claimed late 2nd quarter 2020 release date.

                    Dare to be different and all, you know. I change my mind about every 14 seconds.

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                      #11
                      PSA has dissipators with a midlength gas system and a pinned A2 front sightpost with full length handguard. Something about the barrel length, dwell and gas system that makes dissipators a little less reliable, but this fixes that issue(?)

                      I built one and it is my echo trigger platform. Gassed perfect out of the gate and never fails to go bang

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                        #12
                        Pics?

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                          #13
                          New question!

                          So ideally, I want a slick side, carry handle upper, preferably with a brass deflector. However, that is not a thing (except a “model 750”, which I’m not going to find for a price I’m going to spend).

                          The brownells retro upper is all those things except no brass deflector and no M4 feedramps.

                          How much would I hate that over just getting a flat top slick side and adding a carry handle?

                          I read that a lefty can eat some brass in the cheek without the deflector. I am righty but sometimes lefty’s touch my things that go bang. The feedramps seem like a worthwhile upgrade.

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                            #14
                            I have to ask a question, why? I mean from a ergonomic point the style is way out of date, far better and lighter tech has come along. I guess I don't get the "old look just because" thing.
                            “Christianity neither is, nor ever was a part of the common law.”-Thomas Jefferson, 2/10/1814

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                              #15
                              Because I want to put together something I haven’t seen anyone else do. I understand it’s kinda dumb, like hopping up a Subaru. I already have 10.5, 16 in both carbine and mid length gas, and a 15.5 mid length gas. But I don’t have a 16 inch rifle gassed upper. It seems everyone that does a 605 style, they try to copy the prototype. I envision a more modern, updated version.

                              How much will I hate the brownells upper over a, let’s say, aero precision slick side flat top?
                              Last edited by _stucky; 05-28-2020, 08:55 AM.

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