AR15: buy one of these, or wait? - Page 3

AR15: buy one of these, or wait?

This is a discussion on AR15: buy one of these, or wait? within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; Aus71383 and Chooie are exactly correct. Getting the chamber reamed is inexpensive insurance, and there's no reason it shouldn't be done unless you are building ...

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Thread: AR15: buy one of these, or wait?

  1. #31
    BAC
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    Aus71383 and Chooie are exactly correct. Getting the chamber reamed is inexpensive insurance, and there's no reason it shouldn't be done unless you are building a dedicated precision rig and will never be shooting 5.56 NATO ammunition through it.


    -B
    RIP, Jeff Dorr: 1964 - July 17, 2009. You will be missed.


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  2. #32
    Senior Member Array XD in SC's Avatar
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    Quote Originally Posted by aus71383 View Post
    The external dimensions of the .223 Remington and 5.56mm NATO cartridges are the same. The difference is that 5.56mm NATO is loaded to higher pressures than the .223 Remington.

    The difference between a .223 Remington chamber and a 5.56mm NATO chamber is invisible to a normal person. Both rounds will chamber without a problem. However, the leade, throat, and freebore of the chambers are different. In general a .223 Remington chamber has more accuracy potential. The difference in accuracy is very slight or non-existent.

    The differences in the chamber dimensions make it unsafe to fire 5.56mm NATO ammunition in a barrel chambered in .223 Remington. By having the chamber reamed (re-cut to 5.56mm NATO chamber specs) you will be able to safely fire either type of ammo in your gun.

    Hope this helps. I'm no scientist, nor a teacher.

    Austin
    So this applies if I plan to shoot 5.56 NATO ammo through it?
    Sean
    XD 9SC | XD 45ACP Service | XD 45ACP Compact |Borealis
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  3. #33
    New Member Array Hydra-shokz's Avatar
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    The BM should already be chambered for the 5.56.
    Patrick

  4. #34
    Senior Member Array Sarge45's Avatar
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    The Bushmaster will run 5.56 just fine without reaming. They are made with the 5.56 dimensions. No problems with mine.

  5. #35
    BAC
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    Talk to Grant at G&R Tactical, and any number of other gunsmiths who have 5.56 reamers. I don't know of any of them who have ever run a reamer through a Bushmaster that didn't come out with excess material.

    Like I said, it's inexpensive insurance that your gun works safely. Have it reamed.

    Quote Originally Posted by XD in SC View Post
    So this applies if I plan to shoot 5.56 NATO ammo through it?
    Yes.


    -B
    RIP, Jeff Dorr: 1964 - July 17, 2009. You will be missed.


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  6. #36
    VIP Member Array edr9x23super's Avatar
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    You better buy now, I bought 2 weeks before the election, and my co-workers laughed at me. I bought a DPMS Sportical for $625 through gunsamerica;

    Now 2 of my co-workers have each offered me $1200 for the gun.
    "Guard with jealous attention the public liberty. Suspect everyone who approaches that jewel. Unfortunately, nothing will preserve it but downright force. Whenever you give up that force, you are inevitably ruined". - Patrick Henry

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