Results 1 to 3 of 3

Thread: What is the difference between a SPC I and SPC II chamber?

  1. #1
    Member
    Join Date
    Jun 2011
    Location
    Greenville, Tx
    Posts
    193

    What is the difference between a SPC I and SPC II chamber?

    Folks,

    I just bought a Smith M&P piston AR15 in .223. I want to buy a Rock River 6.8 SPC upper to go on this gun for the piggies. I was looking at 6.8 SPC loading data and some loads recommend using an SPC II chamber. Does this mean it can operate at higher pressures with reloads? I dont know what this Smith M&P is. I need to do some research to find out. Any info is greatly appreciated.

  2. #2
    Senior Member breamfisher's Avatar
    Join Date
    Jun 2011
    Location
    Living in a van, down by the river.
    Posts
    6,941

    Re: What is the difference between a SPC I and SPC II chamber?

    SPC II has a longer leade, and normally comes in a barrel with 4 grooves and a slower twist. They will allow for higher pressure loadings. It's only a 6.8 thing, so the M&P being a .223 will be either a .223 chamber or a 5.56.
    Unless we each conform, unless we obey orders, unless we follow our leaders blindly, there is no possible way we can remain free. - Maj. Frank Burns

  3. #3
    Moderator Jayhawker's Avatar
    Join Date
    Jun 2011
    Location
    Smoky Valley, Kansas
    Posts
    7,749

    Re: What is the difference between a SPC I and SPC II chamber?

    Quote Originally Posted by WORLD T View Post
    Folks,

    I want to buy a Rock River 6.8 SPC upper to go on this gun for the piggies.
    Bream is spot on...

    Check out STAG 6.8 uppers as well....top of the line...
    Sharps Model 1874 - "The rifle that made the west safe for Winchester"

Posting Permissions

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