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Replacement front sight bead

Discussion in 'Mossberg SA-20' started by AbyssDncr, Jan 12, 2015.

  1. AbyssDncr

    AbyssDncr .410

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    31
    Has anyone replaced their front sight? It looks like mine is glued into the rib on my Bantam, and there are no flats on the bead to be torqued. I took the choke out and the front sight hole doesn't go all the way through the barrel, so I can't confirm from the bottom of the hole either...

    Planning on dropping in a Marbles tritium bead, and will probably just go with a 6-48, but if it's already for something, that'd be nice to know too...
  2. BrianJ

    BrianJ .270 WIN Supporter

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    115
    Me too. trying to get a slightly higher and larger bead. don't know how it comes out or the thread if there is one.
    Any help appreciated.
  3. AbyssDncr

    AbyssDncr .410

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    31
    I found some cross-reference chart somewhere that indicated that it "ought" to be M3x0.5, so I threw caution to the wind and ordered one from Marbles. Should know for sure some time next week...
  4. BrianJ

    BrianJ .270 WIN Supporter

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    115
    How would you get the old one out? Mine has no wrench flats.
  5. AbyssDncr

    AbyssDncr .410

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    31
    Curiosity got the better of me... It's threaded and glued. Heat and gentle, but consistent coaxing With a variety of needle nose pliers and wire cutters convinced it to pull up roots and come on out. Ruined the bead mind you, but that was pretty much a forgone conclusion from the beginning.

    OD of the sight threads mic' out at 2.89mm. Think it's gonna work! :cool:
    old mossy likes this.
  6. AbyssDncr

    AbyssDncr .410

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    31
    Sights showed up today! :) Apparently, though my idea of "First Class" shipping ($3 USPS) and their idea ($15 Fedex) is hugely different though... :(

    My gamble paid off...of sorts. The thread pitch matches, but the sight threads are a little oversized for the gun(s). Looks like I'm gonna need a bottom tap to chase all the goop out of the threads in the SA-20. On the other hand, the 459 is sporting tritium tonight! :D

    The glow isn't that spectacular, but it's certainly there in the dark, and the big white dot is a massive improvement in the day. Kinda pissed about the jacked up shipping charge, but I'd do it again, I'd just be more clear about my shipping options.
  7. AbyssDncr

    AbyssDncr .410

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    31
    Got my 3mm tap in today and cleaned the threads out on the SA-20.

    It looks crooked in the pic, but it really isn't. Calling it a win. :D

    [​IMG]
    old mossy likes this.
  8. old mossy

    old mossy Global Moderator Staff Member Global Moderator Forum Moderator

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    12,476
  9. MikeD

    MikeD I'm Your Huckleberry Staff Member Global Moderator "Philanthropist"

    Messages:
    11,383
    Looks good!
  10. AbyssDncr

    AbyssDncr .410

    Messages:
    31
    Thanks!

    Now, if anyone else goes to try this, I've got a lovely 3mm tap that's never been dropped and only fired once... ;)
    old mossy and MikeD like this.
  11. sneektip

    sneektip .22LR

    Messages:
    11
    Abyss- did you put the same tritium bead on both your SA459 and SA20?

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