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Thread: Hypothetical: What Still Needs Fixing?

  1. #101
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    Quote Originally Posted by Arctic1 View Post
    Heat from the propellant and hot gases, but also heat from the contact/friction between the projectile passing through the barrel.

    One common approach to help cooling is to increase the surface area of the barrel - dimpling or fluting. I think the jury is out on the actual effectiveness. It does reduce the weight of the barrel itself.

    A thicker barrel profile doesn't reduce the generated heat, but makes the barrel more resilient to the effects of heat - it also adds weight.
    You could put a aluminum heat sink on the barrel:


    Then leave it open on the back end and then extend the barrel shroud beyond the muzzle so the muzzle blast causes air to flow through the fins and cool the barrel... Wait, that's been done. Worked pretty good at allowing for a higher sustained rate of fire, but the shroud got pretty hot as well....


  2. #102
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    I think we should hypothetically examine improvements to the Lewis gun. My first suggestion would be some sort of durable mini-dirigible to help tote the 28 pound beast.

  3. #103
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    Another thought for the CNC guys. Make a new AR. Half way between the AR15 and AR10. Mag length 2.55? That way you could use all those 6mm wildcats at mag length. A dasher AR that magazine feeds!

    I have been thinking a lot about the design of the AR receiver/barrel connection myself. This system was not originally designed for 26" 5.5# barrels.

    Wonder if anyone will ever design an upper with a whole lot more meat at the receiver/barrel connection? Wonder if it would be possible to thread the receiver/barrel connection like a bolt gun? Tony Kidd is doing it with his 10/22 receivers. It would certainly be a niche market. Bet it would improve accuracy. With todays CAD milling machines it shouldn't be that hard. Varmint and long range guys would like it though.

  4. #104
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    Quote Originally Posted by rcoodyar15 View Post
    Another thought for the CNC guys. Make a new AR. Half way between the AR15 and AR10. Mag length 2.55? That way you could use all those 6mm wildcats at mag length. A dasher AR that magazine feeds!

    I have been thinking a lot about the design of the AR receiver/barrel connection myself. This system was not originally designed for 26" 5.5# barrels.

    Wonder if anyone will ever design an upper with a whole lot more meat at the receiver/barrel connection? Wonder if it would be possible to thread the receiver/barrel connection like a bolt gun? Tony Kidd is doing it with his 10/22 receivers. It would certainly be a niche market. Bet it would improve accuracy. With todays CAD milling machines it shouldn't be that hard. Varmint and long range guys would like it though.
    Are you going to make your own mags then? Seems like that might be a little tricky.

  5. #105
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    Quote Originally Posted by skp View Post
    Are you going to make your own mags then? Seems like that might be a little tricky.
    I would think that if you control the design of the weapon, getting the mags right would be one of the less difficult parts. Especially with manufacturers like Magpul out there. Also, I know nothing about design, so this opinion is worth what you paid for it.

  6. #106
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    Quote Originally Posted by taekwondopreacher View Post
    I would think that if you control the design of the weapon, getting the mags right would be one of the less difficult parts. Especially with manufacturers like Magpul out there. Also, I know nothing about design, so this opinion is worth what you paid for it.
    I've no doubt that Magpul could do it but I got the impression he wants to make a prototype.
    Don't forget how much time it took to develop reliable 30 round 5.56 mags though.

  7. #107
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    Quote Originally Posted by skp View Post
    I've no doubt that Magpul could do it but I got the impression he wants to make a prototype.
    Don't forget how much time it took to develop reliable 30 round 5.56 mags though.
    I don't know the results from it, but I believe that Magpul has made intermediate sized 6.8 SPC mags that were/are proprietary to LWRC's platform.

  8. #108
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    Quote Originally Posted by skp View Post
    I've no doubt that Magpul could do it but I got the impression he wants to make a prototype.
    Don't forget how much time it took to develop reliable 30 round 5.56 mags though.
    I don't want to make a prototype. It would be nice to see one of the receiver manufacturers take this project on. These days if you can get it on paper then those CNC machines can make it. If you have the equipment then the only extra expense you would have would be tweaking the design in cad. Stretching an AR15 lower a quarter of an inch and leaving the barrel attachment part of the receiver full thickness should not be that difficult. Neither would threading that chunk of aluminum for the barrel to thread into. Milling out the locking lug recess in the barrel should be no different than milling it out in a barrel extension.

    I am sure there are those out there who would make custom mags for a price. Like you say the mags would take some work but I am sure reliable mags could be made.

    Just a Hypothetical. Maybe someone will like the idea and do it. Tony Kidd is threading his receiver barrel connection for his supergrade 10/22

    I sure would like to have a super accurate AR-Dasher that would magazine feed.

  9. #109
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    Quote Originally Posted by lysander View Post
    You could put a aluminum heat sink on the barrel:

    Then leave it open on the back end and then extend the barrel shroud beyond the muzzle so the muzzle blast causes air to flow through the fins and cool the barrel... Wait, that's been done. Worked pretty good at allowing for a higher sustained rate of fire, but the shroud got pretty hot as well....
    Aluminum heat sinks are a joke, you dont have enough surface contact with the barrel to make the thermal transfer efficient enough for it to be worth it and you would be screwing with the barrel harmonics. You would have to either machine the cooling fins into the barrel itself or use some kind of metallic thermal paste to glue the heat sink to the barrel.

  10. #110
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    Quote Originally Posted by vicious_cb View Post
    Aluminum heat sinks are a joke, you dont have enough surface contact with the barrel to make the thermal transfer efficient enough for it to be worth it and you would be screwing with the barrel harmonics. You would have to either machine the cooling fins into the barrel itself or use some kind of metallic thermal paste to glue the heat sink to the barrel.
    Apparently, you can't recognize a joke when you read one....

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