Heat Dissipation.....

Discussion in 'AR-15 Discussion' started by EW1066, Jul 2, 2012.

  1. EW1066

    EW1066 Member Supporter

    Is it important to be able to dissipate heat from the barrel if you are not shooting full auto? I understand that there is a point long before barrel failure where shooter comfort comes into play. However, that issue aside, will accuracy be better served by a cool barrel as opposed to a hot barrel?

    Here is the reason for the question. While watching an episode of "How it's Made" they showed "Trane" A.C.'s being made and the "spine fin tubing" looked like it could be wrapped around a barrel and still fit inside a free float tube. I thought to my self " WOW That would be cool" no pun intended. But then I thought "Is that a solution looking for a problem?".So I thought I would deffer to the "experts" here.

    Here is the episode. The "spine fin tubing" is the first thing that they show being made.



    ETA : not really talking about the tubing as much as the "spine fin" heat sink material itself.
    Last edited: Jul 2, 2012
  2. Quentin

    Quentin New Member

    I think accuracy would be best after a few shots to warm up the barrel but not to the heat of full auto fire. I've heard one shot every 15 seconds is best for accuracy as the barrel remains at optimum temperature.

    Anyway, not an expert but I think the spine fin tubing would be a waste of time and could even adversely affect normal barrel harmonics.

  3. mountainman13

    mountainman13 New Member

    It's not really worth worrying about to that degree. You're more likely to have a round cook off long before anything really happens with the barrel. You would probably have to dump around 300 rounds as fast as possible before that happens. Alot of guns actually tend to run better once they are warmed up.
  4. JonM

    JonM Moderator

    if you need a high sustained rate of fire and maintain decent accuracy you need a milspec chrome line chrome chambered barrel. its the big reason i went bcm since they are the only ones that disclose what metals their barrels are made of. my carbine loses no practical accuracy from cold to smoke coming off the metal. its not a tack driver cold or hot but it is minute of goblin to as far out as i care to go with it. i got other rifles for precision accuracy if its called for
  5. purehavoc

    purehavoc New Member

    Jon same deal here , it doesnt take long to make the barrel smoke but in all honesty accuracy is no different than 50 round before it started smoking and the handguard was HOT!!! it will get uncomfortable to hold before you loose accuracy .
  6. c3shooter

    c3shooter Administrator Staff Member

    Years back, makers tried different things to radiate heat off from the barrel, Look at the fins on a 1928 Thompson. Then they realized that they were better off with a solid, heavier barrel- it serves as a heat sink. The coils on the heat pump are having heat delivered to them continuously.

    Just HOW hot is going to be driven by powder used, loading, and weight of barrel, ambient temps, and rate of fire. I can shoot 22 LR til the cows come home, and have a barely warm barrel. Also have a very lightweight .308 that after 5 rounds rapid fire you do NOT want to grab the barrel with a bare hand. :eek: