gas block size - matters?

The #1 community for Gun Owners of the Northeast

Member Benefits:

  • No ad networks!
  • Discuss all aspects of firearm ownership
  • Discuss anti-gun legislation
  • Buy, sell, and trade in the classified section
  • Chat with Local gun shops, ranges, trainers & other businesses
  • Discover free outdoor shooting areas
  • View up to date on firearm-related events
  • Share photos & video with other members
  • ...and so much more!

    • Register Log in
    davsco

    davsco

    Ultimate Member
    Oct 21, 2010
    8,624
    Loudoun, VA
    so does the gas block size matter, ie .750 vs .875, or is it just based on the barrel profile/contour and where it's placed. ie bull barrels just generally have larger gas block diameters by virtue of their "girth."
     
    inkd

    inkd

    Ultimate Member
    Aug 4, 2009
    7,530
    Ridge
    davsco said:
    so does the gas block size matter, ie .750 vs .875, or is it just based on the barrel profile/contour and where it's placed. ie bull barrels just generally have larger gas block diameters by virtue of their "girth."
    Click to expand...

    It doesn't matter. A gas port is going to be whatever dimension it needs to be, no matter what the diameter of the barrel is.
     
    L

    lazarus

    Ultimate Member
    Jun 23, 2015
    13,728
    I mean, technically a larger gas block would have more surface area to radiate heat as well as likely more mass to absorb heat as well.

    Not going to make a lick of difference unless you are attempting to melt the thing down.
     
    outrider58

    outrider58

    Eats Bacon Raw
    MDS Supporter
    Jul 29, 2014
    49,992
    davsco said:
    so does the gas block size matter, ie .750 vs .875, or is it just based on the barrel profile/contour and where it's placed. ie bull barrels just generally have larger gas block diameters by virtue of their "girth."
    Click to expand...

    Those dimensions refer to barrel diameter at the gas port journal. Not the gas port opening. So yes, size does matter. .750 means the barrel diameter at the journal is 3/4" wide. .875 is around 7/8" diameter. Your block MUST match your barrel diameter.
     
    L

    lazarus

    Ultimate Member
    Jun 23, 2015
    13,728
    outrider58 said:
    Those dimensions refer to barrel diameter at the gas port journal. Not the gas port opening. So yes, size does matter. .750 means the barrel diameter at the journal is 3/4" wide. .875 is around 7/8" diameter. Your block MUST match your barrel diameter.
    Click to expand...

    Well that part is absolutely true. Unsure if OP was asking if the size mattered for his well it worked. Which if it doesn’t match the barrel size...matters one he’ll of a lot. So long as it matches the barrel though, there isn’t really a difference in a gun with a .75, .875 or .625”. Other than the barrel itself has some obvious extra or less meat to it.
     
    outrider58

    outrider58

    Eats Bacon Raw
    MDS Supporter
    Jul 29, 2014
    49,992
    There was some confusion in subsequent posts referring to gas ports, which I don't believe OP was asking(but who knows?). In respect to gas ports, if anyone cares, they do vary in diameter, depending on barrel lengths. The longer the barrel(read dwell time), the smaller the port. The shorter the dwell time, the wider the gas port.
     
    You must log in or register to reply here.

    Users who are viewing this thread

    Total: 2 (members: 0, guests: 2)
    MD Elite Firearms Sales

    Latest posts

    Forum statistics

    Threads
    275,406
    Messages
    7,280,465
    Members
    33,450
    Latest member
    angel45z

    Latest threads

    Top Bottom