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Thread: Cetme L build planning

  1. #151
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    I do have a reamer. And I have a reamer print to match.

    I have a 25 inch barrel blank, of which 18 to 20 inches needs to become a barrel. I think I have a scrap of 4140 and the right size drill, too.

    The bore is only 0.270, can your tooling fit?

  2. #152
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    Quote Originally Posted by Xnke View Post
    I do have a reamer. And I have a reamer print to match.

    I have a 25 inch barrel blank, of which 18 to 20 inches needs to become a barrel. I think I have a scrap of 4140 and the right size drill, too.

    The bore is only 0.270, can your tooling fit?
    Nope, I'd just need to make a slightly smaller tool holder and since the chamber is based on the shorter .223 cartridge it doesn't need to be as long as what I've been using either. You could even use cold rolled steel for the practice piece, it's just to prove out the tooling and program. It has to be chambered to the same depth you are going to chamber your barrel blank and have the same OD.

    I'd need a copy of the reamer print and also need to know how much cartridge stick out you're going to have beyond the barrel face. Typically the stick-out equals the depth of the bolt face counterbore +.009".

    I thought I was done chamber fluting forever until I got stuck with the POS RCM barrel and had to make my own replacement. Besides, I love one-of-a-kind builds and this one looks like it's going to be pretty cool. I can at least try to help a little (and hope it works).

  3. #153
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    This also brings up an interesting question as to the width and depth of the chamber flutes. I can't remember if the .223 flutes were the same as .308 flutes or smaller. I have a piece of an HK53 chamber in the shop and if memory serves the flutes were different.

  4. #154
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    There is an L chamber photo in this thread, I think the .223 L used 12 flutes.

    I have been aiming for 9, but that was just a WAG. I'll get the reamer print and post it tonight when I get home from job hunting.

    EDIT: Here's the reamer print that my reamer was supposed to be made to match.

    Last edited by Xnke; 12-08-2018 at 12:38 AM.

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