Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: benefit over gov profile barrel over light weight?

  1. #1
    Join Date
    Nov 2012
    Posts
    202
    Feedback Score
    0

    benefit over gov profile barrel over light weight?

    Hey guys, I'm looking at the DD gov profile barrel, it has the fatter barrel forward the gas block but looks like a regular pencil barrel from the gas block back.

    Whats the point for the bigger barrel in the front?

  2. #2
    Join Date
    Dec 2009
    Location
    Utah
    Posts
    8,421
    Feedback Score
    3 (100%)
    None. Nothing wrong with the gov profile barrel but having a thicker portion forward of the gas block makes no sense. Barrel profile is an oft discussed subject. A search using the words "barrel profile" turned up the following-
    https://www.m4carbine.net/google.php...023j3759645j14

    -which should provide hours of reading fun!
    Last edited by MistWolf; 01-07-14 at 10:30.
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  3. #3
    Join Date
    Nov 2012
    Posts
    202
    Feedback Score
    0
    Kinda what I was thinking, does it swing better? I hear about the over heat issues, but I'm not real worried about that, I won't be in a war, if anything at most will be used in 3gun or a class.

  4. #4
    Join Date
    Dec 2009
    Location
    Utah
    Posts
    8,421
    Feedback Score
    3 (100%)
    All the heat is generated at the chamber end. The extra material is as far from the heat source as it can be and does little to help cool the rifle. It would make more sense if the material was located at the chamber end
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  5. #5
    Join Date
    Feb 2009
    Location
    Western KY
    Posts
    1,260
    Feedback Score
    45 (100%)
    Grant from G&R had said that the incresed Rigidity on the NATO Profile Barrel was needed for mounting a M203 Grenade Launcher.

    I don't think you can necessarily go wrong with either one.

    Heavier Contoured barrels maintain their accuracy longer, as the barrel heats up, over lighter weight contours...however, lighter weight contours do cool down faster than their heavy counterparts.

  6. #6
    Join Date
    Dec 2009
    Location
    Utah
    Posts
    8,421
    Feedback Score
    3 (100%)
    Lighter contour barrels have less mass and for the same barrel length have smaller diameters. When a lighter contour barrel is heated with the same amount of heat, it's temperature will be higher. With less surface to radiate the heat, it will actually take longer to cool
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  7. #7
    Join Date
    Jul 2013
    Location
    AZ
    Posts
    115
    Feedback Score
    11 (100%)
    I recently purchased a BCM lightweight middy after years of Govt. and HB shooting. I would have to say I wish I was shooting lightweight from the beginning. Ounces are very noticeable even though I never thought they would be. POI shift when barrel heated is minimal. I love it and have no regrets on my recent purchase. BTW I have DD omega rail installed on it with a T-1 for an optic so very nice and light.

  8. #8
    Join Date
    Feb 2009
    Location
    Western KY
    Posts
    1,260
    Feedback Score
    45 (100%)
    Quote Originally Posted by MistWolf View Post
    Lighter contour barrels have less mass and for the same barrel length have smaller diameters. When a lighter contour barrel is heated with the same amount of heat, it's temperature will be higher. With less surface to radiate the heat, it will actually take longer to cool
    I'm going to have to Respectfully Disagree with you there, sir.

    I've had Pencil Barrel thru MTU Contours fyi.

  9. #9
    Join Date
    Dec 2009
    Location
    Utah
    Posts
    8,421
    Feedback Score
    3 (100%)
    If heated to the same temperature the lighter barrel will cool to room temperatures faster because it contains less heat. Again, if a heavier barrel and lighter barrel were heated to with the same heat, that is the same amount of heat, the lighter barrel will be at a higher tempreature due to it's lesser mass. It will take longer to cool to room temperature because it has less surface from which to disapate the heat. It's the law of thermodymics
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  10. #10
    Join Date
    Mar 2011
    Posts
    2,056
    Feedback Score
    5 (100%)
    Quote Originally Posted by HD1911 View Post
    Grant from G&R had said that the incresed Rigidity on the NATO Profile Barrel was needed for mounting a M203 Grenade Launcher.

    I don't think you can necessarily go wrong with either one.

    Heavier Contoured barrels maintain their accuracy longer, as the barrel heats up, over lighter weight contours...however, lighter weight contours do cool down faster than their heavy counterparts.
    This statement defies physics. On an A2 rifle, where the Gov profile originated the M203 is all behind the thicker portion. If anything the weight at the end past the M203 would cause droop. The M4 barrel is so asinine there are no words for it, and no it would not add ridgity, its still just going to bend at all the thin points.

    Quote Originally Posted by MistWolf View Post
    None. Nothing wrong with the gov profile barrel but having a thicker portion forward of the gas block makes no sense. Barrel profile is an oft discussed subject. A search using the words "barrel profile" turned up the following-
    https://www.m4carbine.net/google.php...023j3759645j14
    -which should provide hours of reading fun!
    There is something wrong with it, and that is it.

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •