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filing down the magazine catch , bad lower?

Discussion in 'Black Rifle Forum' started by raven11, Dec 6, 2011.

  1. raven11

    raven11

    8,759
    6
    Jan 27, 2009
    Illinois
    I'm building my second lower and on one of my lowers both magazine catch fit but the on the other lower the magazine catch is a bit too wide.

    the lower is a Delaware Machinery and the lower is off a Rguns lower parts kit. needless to say this build is sort of on the cheap.

    I'm wondering did I get a out of spec lower or sometimes you need to file the magazine catch down to get it to fit?

    thanks everyone !
     
  2. WoodenPlank

    WoodenPlank Who?

    7,958
    3
    May 15, 2010
    NW Florida
    I assume you are referring to the bar of the mag catch/release, not the button. If you have to file something to get it to fit in the lower, one of those two parts is definitely out of spec.
     


  3. AK_Stick

    AK_Stick AAAMAD

    17,401
    1,124
    Jan 20, 2004
    Alaska, again (for now)
    I think its more likely the lower is suspect not the parts kit.....

    Maybe just me, but I'd mic both the lower and the button and file the one that's out of spec.
     
  4. raven11

    raven11

    8,759
    6
    Jan 27, 2009
    Illinois
    it is the the "bar" that won't fit. I agree Stick , I want to say it is the lower because both bars have no problem fitting the other lower so I guess i'll just file one of the bars down.


    thanks guys
     
  5. WoodenPlank

    WoodenPlank Who?

    7,958
    3
    May 15, 2010
    NW Florida
    I would actually (CAREFULLY) try to work on the lower to get it back in spec. The problem you will run into either way is making sure the bar is positioned correctly after you are done filing to get proper magazine lockup and height. If it's too far off (high OR low, either from the bar being the wrong size or the latch cut in the lower being in the wrong place), youll either have to beat the magazine into the mag well with a hammer (and getting some bolt drag) or the mag sitting too low and getting feed issues.

    Edit to add: You might want to take it to a local gunsmith that specializes in ARs, and see if they can get it back in spec.
     
    Last edited: Dec 6, 2011
  6. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

    36,125
    483
    Nov 24, 2005
    Troy
    File or stone the mag release to fit the "out of spec" lower.
    Always TRY to modify the cheaper & more easily replacable part.
     
    Last edited: Dec 7, 2011
  7. I agree with this method as a first step. The lower is the firearm and is much more difficult to replace if you bugger it up.
     
  8. zhix

    zhix

    1,121
    0
    Jan 31, 2010
    I remember a while back some places selling that brand of lower at a super low price, then I read several reviews of holes being misaligned/missing/out of spec.
     
  9. Mayhem like Me

    Mayhem like Me Semper Paratus

    18,267
    4,159
    Mar 13, 2001
    Not a chance
    THIS by a wide margin..
    Also check to mahe sure some of the forging is not remaining as a ridge preventing the part from fitting , if you see a small ridge or hump knock that off with a file the lower should be forged, the mag catch will be MIM or cast and could have flashing on it as well.
     
    Last edited: Dec 8, 2011
  10. GSSF17

    GSSF17 ...2 of 'em

    1,280
    1
    Jan 25, 2009
    Central FL
    ...gotta kinda wonder what else may be out of spec. Scary.:whistling:
     
  11. raven11

    raven11

    8,759
    6
    Jan 27, 2009
    Illinois
    you have to be a mindreader before I started filing the magazine release bar I took a flashlight to the lower and there was a slight ridge on the lower inside the magwell, I took a file to it and lo and behold the magazine bar dropped in like normal

    thanks guys , you saved me having to buy a new lower
     
    Last edited: Dec 9, 2011
  12. Mayhem like Me

    Mayhem like Me Semper Paratus

    18,267
    4,159
    Mar 13, 2001
    Not a chance
    Yep that happens even with quality lowers I build about 5 a year and every once in awhile I'll find a ridge somewhere. Glad you didn't have to modify the parts.

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