Pennsylvania Firearm Owners Association
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  1. #1
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    Default S&W M&P15 lower multi caliber concerns...

    Some ar15's have lowers marked multi caliber.

    The s&w has no such markings. Not even a 5.56/.223 marking on the lower.

    Is there any concern with using other calibers on a s&w lower?

    Has anybody done this and had a problem?

    I have nothing in mind, but would rather know of any limitations before I buy another caliber upper. Just trying to learn for now.

    Thanks,
    -Zach

  2. #2
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    Default Re: S&W M&P15 lower multi caliber concerns...

    Quote Originally Posted by zachomega View Post
    Some ar15's have lowers marked multi caliber.

    The s&w has no such markings. Not even a 5.56/.223 marking on the lower.

    Is there any concern with using other calibers on a s&w lower?

    Has anybody done this and had a problem?

    I have nothing in mind, but would rather know of any limitations before I buy another caliber upper. Just trying to learn for now.

    Thanks,
    -Zach
    Personally, I'd be much more concerned if I had a .223/5.56 lower on a .300 build and running into Officer Fudd than having a non-caliber-specific lower with a random upper.

    That said, I don't know the *legal* answer to the .300 build scenario.

    Experienced folks wanna chime in?

  3. #3
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    Default Re: S&W M&P15 lower multi caliber concerns...

    I'm almost certain that the only time the marking is of concern is with NFA items which need to be marked.
    That's probably the reason "multi-caliber" markings came about in the first place. (for NFA - "multi" covers all bases and allows them to be swapped at will)

  4. #4
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    Default Re: S&W M&P15 lower multi caliber concerns...

    Thompson Contender's and Encore receivers have never been marked with caliber.

    Traditionally only barrels have been marked with caliber. I think any type of marking on an AR lower designating caliber and building something different is completely unfounded worry.

    Save for an NFA build.
    www.Steelvalleycasting.com is your new home for coated bullets and custom ammo.

  5. #5
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    Default Re: S&W M&P15 lower multi caliber concerns...

    There is zero legal requirement for a gun to be the caliber its marked. For NFA stuff it only applies to how you register it, not how the gun is marked.
    NOBODY NEEDS ASSAULT SPEECH

  6. #6
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    Default Re: S&W M&P15 lower multi caliber concerns...

    Quote Originally Posted by raxar View Post
    There is zero legal requirement for a gun to be the caliber its marked. For NFA stuff it only applies to how you register it, not how the gun is marked.
    For those unfamiliar with NFA... Huh?

  7. #7
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    Default Re: S&W M&P15 lower multi caliber concerns...


  8. #8
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    Default Re: S&W M&P15 lower multi caliber concerns...

    Quote Originally Posted by Emptymag View Post
    For those unfamiliar with NFA... Huh?
    For those who didn't google it like I did. The statement was primarily added to avoid an argument on NFA nuance that I am unaware of.
    NOBODY NEEDS ASSAULT SPEECH

  9. #9
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    Mohnton, Pennsylvania
    (Berks County)
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    Default Re: S&W M&P15 lower multi caliber concerns...

    Quote Originally Posted by zachomega View Post
    Some ar15's have lowers marked multi caliber.

    The s&w has no such markings. Not even a 5.56/.223 marking on the lower.

    Is there any concern with using other calibers on a s&w lower?

    Has anybody done this and had a problem?

    I have nothing in mind, but would rather know of any limitations before I buy another caliber upper. Just trying to learn for now.

    Thanks,
    -Zach
    You have this question because gun laws in general don't make any logical sence. Fortunately this time your worries are unfounded.

  10. #10
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    Default Re: S&W M&P15 lower multi caliber concerns...

    So my question was not about legalities and was more safety oriented. No possible damage to myself or others strapping any ar15 upper on an m&p lower?

    -Zach

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