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Thread: AR BCG question...

  1. 04-07-2021, 01:39 AM #1
    44Blam
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    AR BCG question...

    I bought a bold carrier group from Wilson Combat and it came with the BCG and a little plastic bag with an o ring....

    What is that O ring for???

    I've never seen an o ring anywhere near a bcg...
    WWG1WGA
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  2. 04-07-2021, 01:43 AM #2
    M-Tecs
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    It's a mod for the extractor to increase force. It goes around the extractor spring for claimed increased reliability.

    https://kmtactical.net/product/ar-15-extractor-o-ring/

    https://www.ar15.com/forums/ar-15/-/118-537065/?
    Last edited by M-Tecs; 04-07-2021 at 01:59 AM.
    2nd Amendment of the U.S. Constitution. - "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."

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  3. 04-07-2021, 04:51 AM #3
    Lloyd Smale
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    I use them in all of my ar15s
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  4. 04-07-2021, 07:15 PM #4
    popper
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    Probably a spare or 'use if needed'. thoughtful Bill. I don't know if any of mine have it on the spring or not, never have had a problem.
    Whatever!
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  5. 04-07-2021, 08:46 PM #5
    mvintx
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    I have some that have the O-ring. I have some without an O-ring. For me, they just make it harder to insert the extractor retaining pin.
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  6. 04-08-2021, 12:17 AM #6
    44Blam
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    I've always bought my barrel/bcg together at gun shows where I can make sure that it'll work. Those guys almost always have GO NOGO dummies and you can sick that in the barrel and see if your bolt locks up...

    Now I've got to take those things apart and see if I actually have O rings in them...
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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check