33-round mag "Ohio" Mod

Discussion in 'Second Amendment & Legal' started by rivalarrival, Mar 16, 2012.

  1. rivalarrival

    rivalarrival Are we there yet?

    Disclaimer: I'm not a lawyer, I'm not your lawyer, this isn't legal advice. All opinions on the law presented in this post and in this thread are layperson opinions, not professional legal guidance. For all you know, one of the posters below bet me that I could get you thrown in jail. I'm not saying he did, but I'm not saying he didn't, but I will say he's a bit mean spirited at times and I could use a little extra cash. Do your own due-diligence.

    Disclaimer: I'm not a Glock Armorer, I'm not your Glock Armorer, this isn't armorer advice. All opinions on the modification presented in this post are layperson opinions, not professional Glock guidance. For all you know, that mean-spirited jackass offered me twice as much to see if I could get you to blow your own hand off, and maybe that money is worth more to me than your hand. Do your own due-diligence.

    Ohio has an unusual law that doesn't technically restrict magazine capacity, but does reclassify your 9mm Glock into an "automatic weapon" if you "modify" it to be capable of firing more than 31 rounds between mag changes. Which is a bit silly, but leaves us with a little wiggle room.

    To the best of my knowledge, the magazines themselves aren't directly prohibited. You can buy them from a gun shop. You can own them. You can load them. You can juggle them. You can stick one up your nose for all I care; it's your magazine.

    To the best of my knowledge, (that means if I'm on your jury, when you're tried for doing it, I'll vote in your favor, regardless of what those other 11 folks think) it's legal to modify a 33-round magazines to hold a maximum of 30 rounds, and use these converted magazines in your semi-automatic firearm.

    I haven't yet acquired a 33-round magazine, but I do have an old 17-round magazine to play with. I haven't seen anything to suggest that the 33-round magazines are so different that this won't work. The height of the spacer might need to be adjusted a bit; YMMV.




    Above, we have the magazine insert from the magazine, and a spacer cut from 1/8" Kydex. This spacer is cut such that it sits flush on the insert like this:


    Here are another 5, 1/8" Kydex spacers, cut to fit fairly snugly inside the magazine tube. I used aviation snips to cut the Kydex, and used the insert as my basic pattern. I needed 6 spacers total - 3/4" - to reduce the capacity of this particular magazine by 3 rounds. The 33-round magazines may have different tolerances; YMMV.


    I have not yet tested gluing these spacers together. If you decide to do it, you can't just stack them up straight, you have to offset them a bit so that they fit in the slide. I've exaggerated the offset of the stack a bit, and placed it next to the magazine to show you what I mean:


    Assemble as usual, but with the spacers between the spring and the insert. Check that it's limited to what the state wants, crank the dial up to a legal 91% and rock out with your Glock out. Then go home and write to your state representatives; order them to repeal the silly little rule that made you think this mod was a good idea. Then check to make sure that your mags still only hold 30 rounds, that you can't force in that 31st round once everything settled into place.

    And watch out for that havasu fellow... I'm not saying he wants you to be behind bars with a bloody stump. I wouldn't say that.:D
  2. Ogre

    Ogre New Member

    Took my PW apart and made a 3/4" spacer for it tonight. Really just a small block. Also cleaned the inside, removed burrs with a file and lubricated the spring. Hope to test its functionality in a couple days.

  3. CCSir

    CCSir Well-Known Member Supporter

    Nice mod!

    On another note, this is about the stupidest written law I have seen. Just because someone can insert a 33 round mag into a semi-auto hand gun does NOT make it "fully auto.":mad: I also never understood the purpose of being able to legally purchase and own one but not to use it.


  4. If it were possible I would nominate this thread for "Best Read!"

    And I agree, very stupid rule!
  5. american lockpicker

    american lockpicker New Member

    I live near the Ohio border and 33 round glock mags are readily available in shops and gun shows there.
  6. havasu

    havasu Well-Known Member Supporter

    R/A, You're a rabble-rouser. ;)
  7. Ogre

    Ogre New Member

    Yes you can buy 31+ mags all day every day in Ohio (.22s are exempt). However, many people do not know that using them in a semi auto magically makes them somehow considered "automatic firearms." The laws been on the books since 1971. Some people have had no problems while others have been charged (in the case of g18 mags specifically) over a mere 3 rounds.
  8. philipk

    philipk New Member

    The highest capacity mags that I own are 30 round AR magazines.

    It is the STUPIDEST gun law on the books in Ohio.

    Surprisingly most gun owners are totally unaware of it.

    I have been told that I didn't know what I was talking about when I mentioned this at our gun club. The common reply is "If they were illegal, they wouldn't be sold in state."

    Of course the reply is that they ARE NOT illegal to own. They are only illegal to attach to a firearm as the state of Ohio consider any centerfire gun fully automatic with more than 31 rounds.

    Thus when attach it is not just an illegal magazine as in Illinois, the whole firearm is illegal!
  9. WAIT! Does that mean that they want you to get a Tax Stamp from the ATF to be able to use it?
  10. philipk

    philipk New Member

    It does sound that way. However, you can't get a Tax Stamp from the ATF as the ATF doesn't classify it as a fully automatice weapon.

    Stupid law!
  11. rivalarrival

    rivalarrival Are we there yet?

    Yep! You can buy them anywhere. Magazines are not restricted; firearms with the ability to fire 32 rounds are restricted.

    Here's how the law defines it.

    That same section further defines an automatic firearm as "Dangerous Ordnance"

    This section of the law covers that:
    I'm not completely sure about it (and I'm a little too lazy to check) but I think that means you either have to have the firearm registered with the ATF and pay the $200 tax stamp, or you need a state-issued license or permit to handle "dangerous ordnance."

    (Can you even register a factory G17, G19, or G26 with the ATF as this law would demand?)

    Or, you block the magazine the same way you block a shotgun magazine, and tell your representatives this law is idiotic.

    There are comments floating around the inter-tubes that it's OK to load these magazines with up to 31 rounds and insert them in the gun. I think that this is wrong. The law says " any semi-automatic firearm designed or specially adapted to fire more than thirty-one cartridges". A 33-round Glock magazine loaded with 31 rounds inserted into an unloaded Glock pistol could not fire more than 31 rounds; would not be specially adapted to fire more than 31 rounds; but it would be *designed* to fire more than 31 rounds. My personal opinion is that altering the design to prevent it from holding more than 30 rounds +1 in the chamber renders it legal.

    It's definitely in the running! I would nominate the one that says you can carry any firearm you want, but if you have a steak knife in your lunch bag, you face a weapons charge.
    Last edited: Mar 16, 2012
  12. Is that Ohio as well!?

    Wow, I just realized that Beta C mags and Drum mags for an AR are all illegal there... :confused:
  13. rivalarrival

    rivalarrival Are we there yet?

    Only if you put them in a gun!

    The issue with knives at the state level is only slightly ridiculous: Ohio defines a "deadly weapon" as such:
    Then it goes on to prohibit the concealed carry of a deadly weapon:
    There are a few good exceptions to that law that are broken out separately. This law wouldn't affect the "steak knife in the lunch box".

    But, knives are also regulated at lower levels of government. In many cities, a knife over 2.5" in length, or a fixed-blade knife, or various other categories of knives can be presumed to be weapons.

    Now, with all that said: in my experience, the enforcement of Ohio's gun and weapons laws has been quite tolerable. I've never been in a situation where I felt a law enforcement officer was just looking for a reason to drag me in on some trumped-up weapons-related charge, and they've certainly had opportunities to do so. I've heard numerous anecdotal reports that cops have never heard of the magazine issue, let alone actually attempt to enforce it. My issue isn't because they've been used against us; it's because they *could* be used against us, and it's a felony-level crime that can permanently suspend one's right to carry.
  14. Ogre

    Ogre New Member

    "permit to handle "dangerous ordnance."

    Supposedly one can acquire a permit at your local sheriffs office, given adequate acceptable reasoning, for a dangerous ordnance permit. Most acceptable reasons however are not fun at all. :p
  15. Ogre

    Ogre New Member

    Ran it today with two loads, functioned without error.
  16. havasu

    havasu Well-Known Member Supporter

    Glock Forum is not responsible for the legality of this topic, and advise members to read and understand the entire law, not just perceptions of the law.
  17. rivalarrival

    rivalarrival Are we there yet?


    Finally picked up a pair of 33-round "sticks" from Midway, which arrived in the mail today. First thing I did was tear them down. I realized that the floorplates on the standard floorplates on the "sticks" are "+" floorplates. I swapped floorplates with a couple 17-round magazines, and the sticks became 31-round magazines. (On the big mags, the floorplates are apparently +2; on the 17-round magazines, they're +3, so 20-rounds. No longer will my OCD start acting up when I buy a new box of carry ammo.)

    I tore down the sticks again. This time, I cut up one of the fake credit credit cards that come in the mail all the time. I got 9 spacers from the card, which was enough to reduce the capacity by one round. Bam, 30-round mags that I can insert in my Glock without breaking the Ohio law on weapons designed or adapted to fire >31 rounds without reloading. The finishing touch was a line scribed through the "31" on the back of the magazine to indicate they've been modified.
  18. instead of modifying the mag that far, what i did is bought the 33 round mags, and took the regular g17 mag plates and inserts, and put them on the high cap, and put the +2 extensions on the 17 mag, which turns the 17 round mag to a 19 round and the 33 round mag to a 31 round mag, just a bit of advice for ya to save time with this
  19. damn, just read the post before mine, oh well, i generally do the switch and sell off the stick mags, as i cant use them for duty use, and u sure bout that plus 3 part, ive only gotten +2 outta mine
  20. rivalarrival

    rivalarrival Are we there yet?

    Yeah, I'm definitely going from 17 to 20. Maybe my springs are worn? That last one is pretty tough to get in, but it does go. And Ohio law has a problem with 31-round mags, as the gun is 31+1=32, so I can't just do the swap and be done with it.
    Last edited: Oct 24, 2012