Pennsylvania Firearm Owners Association
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  1. #11
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    Default Re: 9mm build questions

    Quote Originally Posted by Emptymag View Post
    No difference I'm aware of.

    Double check, but I don't think 9mm BCGs have serrations for a forward assist. I'm not 100% sure in that though.
    I bought a slick side upper with no FA and no dust cover.

    Oh! That's probably the difference on a dedicated 9mm upper - they will have the half door dust cover and that "bumper" thing.
    I have no issue shooting mine without one of those and was told it wasn't necessary.

    Tomstactical.com had Aero slick sides WITH a dust cover for a really good price.
    yeah, 9mm uppers have a smaller ejection port, and a lot don't come with dust covers or shell deflectors.

  2. #12
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    Default Re: 9mm build questions

    Got my buffer tube kit today (contains buffer, buffer tube, buffer spring, and end plate).
    Slightly confused and concerned about the tube and buffer.

    The tube has slightly extended area on the threads with a notch. My 5.56 AR tube didn't have this and most I see online don't have it either. This is apparently to retain the buffer retainer better?The buffer is not completely round, it has flat sides on it in 3 areas. So you thread the tube on, get the retainer in the notch, and then to get the buffer in, you turn it so 1 of the flat sides is over top of the retainer and then you have to turn it so the round side is behind the retainer to keep the buffer in place.

    This is what I got:
    https://www.deltateamtactical.com/P....r_p_4135.html#

    My concern is that the buffer may turn during firing and 1 of the flat side will slip over the retainer and cause the gun to malfunction. Is this a valid concern or does the buffer not turn at all?

    Here's a photo showing what I mean:
    http://i.imgur.com/rPJ6Zbp.jpg

    Photos of the complete lower:
    http://i.imgur.com/8yMfq3p.jpg
    http://i.imgur.com/ksNgJz7.jpg

    I just realized that I may need a different buffer anyway. It says pistol buffer but it doesn't say its for 9mm, so I may not be able to use it. That plus the things above, I may end up returning this and getting something else.

  3. #13
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    Default Re: 9mm build questions

    Your buffer is not going to turn and cause a malfunction.
    It's not a valid concern IMO, I've never had a buffer turn and cause a malfunction.
    Maybe it could happen, but I cannot see how, the bolt is holding it from going anywhere as is the back of the buffer tube...

    Lots and lots and lots more buffers have those flats on them.


    The description of the part you posted says for all pistols and rifles so I'd try it before thinking you'll need another one.
    Last edited by 39flathead; June 10th, 2017 at 08:47 PM.

  4. #14
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    Lehigh Valley, Pennsylvania
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    Default Re: 9mm build questions

    Quote Originally Posted by WWGunslinger View Post
    This is what I got: https://www.deltateamtactical.com/P....r_p_4135.html#

    I just realized that I may need a different buffer anyway. It says pistol buffer but it doesn't say its for 9mm, so I may not be able to use it.
    The link says it is a 3 oz buffer, I believe the 9mm requires a heavier buffer so you are likely correct in that. The rest seems OK.
    Last edited by gghbi; June 10th, 2017 at 10:10 PM.
    Illegitimus non carborundum est

  5. #15
    Join Date
    Jan 2007
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    Pittsburgh, Pennsylvania
    (Allegheny County)
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    Default Re: 9mm build questions

    I've actually never seen a "round faced" buffer. All of mine have the three flat sides.
    I don't think it actually slips past the flat spots, but it's easier to remove/insert the buffer at the flat spots.

    The buffer tube itself is universal - not caliber specific.

    And yes, you need a 9mm buffer - it's heavier. Don't use the 3oz carbine buffer.
    I called to check my ZIP CODE!....DY-NO-MITE!!!

  6. #16
    Join Date
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    Default Re: 9mm build questions

    Quote Originally Posted by 39flathead View Post
    Your buffer is not going to turn and cause a malfunction.
    It's not a valid concern IMO, I've never had a buffer turn and cause a malfunction.
    Maybe it could happen, but I cannot see how, the bolt is holding it from going anywhere as is the back of the buffer tube...

    Lots and lots and lots more buffers have those flats on them.


    The description of the part you posted says for all pistols and rifles so I'd try it before thinking you'll need another one.

    Regarding the buffer slipping past the buffer retainer.

    I just learned that you don't even NEED the buffer retainer. It's really just there to keep the buffer in place when you open up the gun for cleaning. (so the buffer doesn't come "sproinging" out when you pull the takedown pin and open it up)

    That CAV-15 polymer lower I'm using for a build? In the assembly video he points out this fact in case you have trouble with inserting the roll pin that holds the buffer retainer in place. (It's DIFFERENT than a normal AR due to the lower and stock being one piece)

    He said that there are actually two benefits to leaving the retainer out: It keeps constant, positive forward pressure on the BCG and it eliminates any chance of teh tab on the buffer retainer from snapping off and falling into the fire control group.

    The downsides? Having to be ready to catch/hold the buffer/spring when you open the gun up.

    I learned something new!
    I called to check my ZIP CODE!....DY-NO-MITE!!!

  7. #17
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    Default Re: 9mm build questions

    I don't have a 9mm AR, I learnt today that you needs heavy buffer.

  8. #18
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    Default Re: 9mm build questions

    Quote Originally Posted by 39flathead View Post
    I don't have a 9mm AR, I learnt today that you needs heavy buffer.

    Yeah, because it's not gas operated, it's blowback and the extra weight is needed to slow it down.

    AND you want the buffer spacer that goes at the other end of the spring.

    You CAN shoot without it, but from what I understand, the spacer prevents possible damage that may occur without it.
    I called to check my ZIP CODE!....DY-NO-MITE!!!

  9. #19
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    Default Re: 9mm build questions

    Thanks all, another question -
    I ordered a 7.5" barrel with a KAK micro flash can (1.75" overall length).
    I want the flash can to be partially inside the handguard.

    I'm trying to figure out what length handguard I will need?

    Will the length of the barrel be 9.75"? So if I got a 9" rail, the flash can will stick out .75"?
    Or do I have to take the threads into account? From what I can tell, the thread is .5" on the flash can, so would it actually be 9.5" length with .25" of the can sticking out?
    Last edited by WWGunslinger; June 11th, 2017 at 12:01 PM.

  10. #20
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    Default Re: 9mm build questions

    Don't count the threads when you're figuring length.

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