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Thread: Gas System?

  1. #1
    Join Date
    Oct 2018
    Feedback Score

    Gas System?

    When do I need to learn about the gas system?

    S&W MP. 16" barrel.

    So let's say I start loading for it. (I've already started, I just haven't done any serious testing yet.)

    I take the recipe straight out of the manual, start at the bottom. Now, I expect some of the lower loads to fail to cycle the action. Just like a 1911.

    Here's my question: if I find a load somewhere in the middle that runs the gun, what, if anything, do I need to know about my gas system? Is my gas system adjustable? Why (and when) would I worry about the gas system on the gun?

    Can't I just find the lowest load that runs the gun and be happy? What is there to be gained by adjusting the gas system? When would I do so, and why?

    Thanks, gang!
    "When I have your wounded." -- Major Charles L. Kelly, callsign "Dustoff", refusing to acknowledge that an L.Z. was too hot, moments before being killed by a single shot, July 1st, 1964.

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  2. #2
    Join Date
    Oct 2011
    Feedback Score
    3 (100%)
    In stock form your rifle does not have an adjustable gas system. Find a load that provides reasonable accuracy and functions reliably. Nothing else more you really need to do.

  3. #3
    Join Date
    Jan 2008
    AZ-Waging jihad against crappy AR's.
    Feedback Score
    104 (100%)
    Most of the M&P rifles I have seen were overgassed. The most recent was a 16" carbine gas with a .068 gas port. You'll be fine with lots of different ammo.

    Owner/Instructor at Semper Paratus Arms

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    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  4. #4
    Join Date
    Feb 2016
    Feedback Score
    11 (100%)
    I was concerned about cycling when I started reloading for the AR. That has not been an issue and I found it an easy cartridge to load. Tons of load data, wide variety of available bullets, and a decent range of powders that it works with.

    I have learned to hate crimped primers with a passion though.



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