What cartridge for 4th SBR, or should I even do it?

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    GeorgeSSR

    GeorgeSSR

    Active Member
    Jan 31, 2009
    196
    Hawkeye said:
    No. OAL is never measured by the handguard, unless the handguard would be somehow permanently attached to the barrel itself. The ATF has a clearly defined method of measuring overall length (which the MSP follows):



    This does not include "non-permanently attached" muzzle devices, but DOES include "permanently attached" ones. A "permanently attached" muzzle device is defined as:



    What some companies or people have done in the past is to permanently attach a large diameter sleeve to the end of the barrel so that the threads of the muzzle are exposed inside the sleeve. Thus the sleeve counts as part of the length of the barrel and the OAL of the gun. Then you can slide a suppressor inside the sleeve and thread it on to the barrel. TacSol makes a couple products like this:

    http://www.tacticalsol.com/tsar300/
    Click to expand...

    Ah, right, that Tactical Solutions upper is exactly what I was thinking about.
     
    Hawkeye

    Hawkeye

    The Leatherstocking
    Jan 29, 2009
    3,971
    GeorgeSSR said:
    Ah, right, that Tactical Solutions upper is exactly what I was thinking about.
    Click to expand...

    Yeah - those are totally legit because the shroud, since it is welded on to the barrel, basically becomes a really long permanently attached muzzle device.
     
    rtruhn

    rtruhn

    Active Member
    Sep 12, 2013
    563
    Gwynn Oak
    Hawkeye said:
    No. OAL is never measured by the handguard, unless the handguard would be somehow permanently attached to the barrel itself. The ATF has a clearly defined method of measuring overall length (which the MSP follows)
    Click to expand...

    Thanks for this. Does anyone happen to know how that method might apply to the Triarii? The entire one-piece chassis may be able to meet the 29" threshold depending on buffer tube/folder/stock choices. But if it absolutely needs to be barrel length - impossible without an absurd replacement barrel.
     
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