close

Privacy guaranteed - Your email is not shared with anyone.

Welcome to Glock Talk

Why should YOU join our Glock forum?

  • Converse with other Glock Enthusiasts
  • Learn about the latest hunting products
  • Becoming a member is FREE and EASY

If you consider yourself a beginner or an avid shooter, the Glock Talk community is your place to discuss self defense, concealed carry, reloading, target shooting, and all things Glock.

sti mags: tweaks to add capacity

Discussion in 'Band of Glockers' started by jundeleon, Jul 21, 2007.

  1. jundeleon

    jundeleon

    530
    0
    Aug 31, 2003
    How do you increase capacity of the 126mm (14 rounds) or 140mm (17 rounds) STI mags for 40sw guns?

    What components (spring, follower, basepad) can be used to maximize capacity?

    Any idea on price/cost of these components?
     
  2. Eye Cutter

    Eye Cutter Moderator

    8,193
    1
    Nov 21, 2002
    Dr. B. Eye
    are you going to compete in ipsc matches in standard division?

    the 140mm bodies are too long. it won't fit the ipsc standard box. you can only use the 126mm magazine bodies.

    a custom basepad, arredondo follower and aftermarket mag springs like wolff will get you 17 rounds of .40cal in each mag. trying to get the 18th round in, you will need shorter springs, making your magazine unrealiable.

    wait natin sila ahtsay, infinity and single stacker. they use sti's for competitions.
     


  3. akula

    akula BizDuc NM Millennium Member

    471
    0
    Oct 11, 1999
    Diri, Diha, Didto
    I was able to buy from a friend a couple of ResComp Mag for STI with a plastic base pad that gives me 18rounds. He said it came from Shooters Connection.

    This is the link to this mag (not to the vendor)
    http://www.rescomp.co.za/rht_pistol_accessories.htm
     
  4. Eye Cutter

    Eye Cutter Moderator

    8,193
    1
    Nov 21, 2002
    Dr. B. Eye
    with the sps and svi mag tubes, you can get 18 rds in.

    with the orig 126mm sti mag tubes with the deep grooves on the sides, mahirap gawin reliable/reloadable na 18rds.
     
  5. jundeleon

    jundeleon

    530
    0
    Aug 31, 2003
    doc ec,

    its not for competition.

    will the sps mag tubes work on the sti edge? are these priced lower than sti mags?
     
  6. ahtsay

    ahtsay

    1,437
    0
    Jan 16, 2006
    Jun I use ISMI spring cut to 10 coils, SVi Red Follower and Tony Olinares basepads. I get 17 rounds reloadable after the springs loosened up. I have 2 SPS mags from Doc EC, pero hinde ko pa siya na totono kaya hinde ko pa ginagamit. Infinity has an SPS mag IPSC box compliant that can hold 19 rounds. I've used that mag in a match, very reliable naman siya. :thumbsup:

    Akula how does the mag perform? I've seen those mags sa website nila and I'm tempted to try one...maganda din yung SV mags.

    Doc gusto ko ng 20 rounder na magazine :supergrin: Possible kaya? Sa MEDCUP, theres this guy that uses 20 rounder mags for standard...pero custom made daw.
     
  7. Eye Cutter

    Eye Cutter Moderator

    8,193
    1
    Nov 21, 2002
    Dr. B. Eye
    yung brazilian mags??? i think that's a myth...

    jundeleon: alam ko the 140mm tubes with grams engineering follower and mag springs and dawson precision basepads can hold 23rds of 40 cal.
     
  8. akula

    akula BizDuc NM Millennium Member

    471
    0
    Oct 11, 1999
    Diri, Diha, Didto
    Aht, I've been using these mags for about a year now. Wala pa namang paltos. I replaced one with an old TP pad, 18 pa rin yung laman, but maliit nalang yung clearance. I use this as my 1st Mag, while the plastic one as my 1st reload (2nd Mag) because maluwag yung clearance. I replaced the plastic, because baka bumigay yung plastic sa kaka-drop during mag change.
     
  9. ahtsay

    ahtsay

    1,437
    0
    Jan 16, 2006
    Ako naman yung 1st reload ko, minsan nag babawas ako ng isa...so 16 nalang para sure yung pasok. Pag 17 kasi, minsan hinde nag s-seat mabuti, nahuhulog eh :supergrin: Doc, check ko ulet ha tapos post ko dito. He finished a stage with just one mag eh, while the others had to reload.
     
  10. eclipse1

    eclipse1 mister mom

    61
    0
    Nov 23, 2004
    left coast
    "jundeleon: alam ko the 140mm tubes with grams engineering follower and mag springs and dawson precision basepads can hold 23rds of 40 cal."

    what tubes? beven is making a new base pad to fit the sps tube that will hold 21 rounds reloadable and will still fit 140 mm, i spoke to beven last sat at a local macth, tuned mags will be ready around sep.
     
  11. bulm540

    bulm540

    1,495
    0
    Jun 18, 2004
    TN
    20 is the max you can get with the 140MM. I have STI mags with grams follwers,springs and basepads. The 21 rounder that grams is tuning is about $150. Don't know if it includes the mags or just the kit
     
  12. Eye Cutter

    Eye Cutter Moderator

    8,193
    1
    Nov 21, 2002
    Dr. B. Eye
    20 rds lang pala sa .40, i thought kasya 23. sa 38super 140mm tubes ko pala kasya yung 23 rds with ismi springs and follower and dp +1 pads. pero i load 22 lang.

    i stand corrected. tnx guys!

    if its going to be used as a house gun and not for competition, pwede kahit yung 170mm tubes, kaya lang ang bigat na noon
     
  13. jundeleon

    jundeleon

    530
    0
    Aug 31, 2003
    The 140mm magazine sticks out of the mag well by how many inches?

    Can anybody post a picture?

    Does it protrude far enough to hamper movement or handling of the gun during competition or shooting sessions?
     
  14. bulm540

    bulm540

    1,495
    0
    Jun 18, 2004
    TN
    In super as you mentioned you can get 23.
     
  15. bulm540

    bulm540

    1,495
    0
    Jun 18, 2004
    TN
    Robbie L did use it.
     
  16. batangueno

    batangueno Shock Resist

    4,804
    0
    Oct 1, 2002
    California
    The only problems that i can see for a 170mm long magazine during competition is the weight and prone shooting. Kapag prone kasi sasayad yung base ng magazine sa ground.
     
  17. i replaced the magazine springs of my sti mags (3 pcs of 126mm) with wolff mags spring. I did this because the stock springs are already soft which caused frequent FTFs. The result is that the wolff springs have very strong tension but they give reliable feeding..no more FTFs. Downside is that the usual 17 rds capacity is now reduced to 15 rounds because of higher tension..:upeyes:

    Advise mga kapatid; should i cut the some coils to accomodate more ammo? baka kasi affected na naman ang feeding..TIA. Btw, the stock springs pala has only 8 coils while the wolff for sti mags has 13 coils...:supergrin:
     
  18. Eye Cutter

    Eye Cutter Moderator

    8,193
    1
    Nov 21, 2002
    Dr. B. Eye
    kaya naman pala puro jam! masyado maikli pag 8 coils lang. hindi na lumalabas sa mag tube yun pag walang basepads.

    11 coils pag .40 cal mag. so you can cut 2 coils and you should be fine.

    when you cut the extra coils, 2 1/2 to 3 coils should still be showing outside the tube.
     
  19. low profile

    low profile

    72
    0
    Mar 15, 2007
    dito lang
    lagi namamatay yan wolf na yan. kuha ka ng ismi at drop in mo tapos ang problema.