Curiosity question about mags

[spirit4earth]

I don’t live in a state that has mag capacity limits, but I was wondering the 2.0 10 rd compliant mags have the same frame/grip as the 15 rd pistols. Is it just something that’s done inside the mag to limit it to 10 rounds, and if so, will a 15 round mag work in a CA MA etc compliant 2.0?

 

[Zed16]

I suspect some manufacturers will alter the internals of the magazine - some do it externally. I've got some 10 round Steyr mags like this: Steyr S9-A1 9mm 10 Rd. Magazine: MGW
Note the plastic bottom of the mag that eliminates 4 rounds. My 14 round Steyr mags are all metal to the plastic butt plate.

 

[OKFC05]

in a s&w M&P, the limiting is done by the mag so the normal mags fit all. this means the normal mag in some states is illegal all by itself!!

 

[spirit4earth]

So it seems like you could use a 15 or 17 rd mag.

 

[spirit4earth]

in a s&w M&P, the limiting is done by the mag so the normal mags fit all. this means the normal mag in some states is illegal all by itself!!

I don’t really get the 10rd limit. Why 10? If there had to be a limit for some states, it seems like 17 makes more sense, since that’s what most full size pistols are.

 

[Rastoff]

So it seems like you could use a 15 or 17 rd mag.

Yes. The gun is the same. It's only the mags that are different.

 

[murphydog]

I don’t really get the 10rd limit. Why 10? If there had to be a limit for some states, it seems like 17 makes more sense, since that’s what most full size pistols are.

You are asking a rational question about irrational decision making. However, such laws may be a useful guide to determining where you might want to live.

 

[FloridaS&W]

I don’t really get the 10rd limit. Why 10? If there had to be a limit for some states, it seems like 17 makes more sense, since that’s what most full size pistols are.

10 round limit is only temporary -- eventually they will reduce it to 7, then 5, then all magazines and semi autos will be restricted or banned; next you will need non lethal projectiles and annual recertification just to qualify for ownership of the firearm. Frogs, meet boiling water.

 

[00 buck]

I don’t live in a state that has mag capacity limits, but I was wondering the 2.0 10 rd compliant mags have the same frame/grip as the 15 rd pistols. Is it just something that’s done inside the mag to limit it to 10 rounds, and if so, will a 15 round mag work in a CA MA etc compliant 2.0?

They are crimped or railed inside most the time

 

[Real Old Navy]

10 round limit is only temporary -- eventually they will reduce it to 7, then 5, .

I've actually heard 6 proposed by an anti-gun politician...might have something to do with revolvers. Can't ban the gun so limit the number of bullets to what most revolvers carry. Nuckin Futs!

 

[jakebrake]

ok, I live in a free-er state. when I bought my used m&p 40, it came with a 10 and a 15.

rather than send the 10 for hammer therapy and recycling, can I make it a 15?

 

[Jim Watson]

The bottom inch and a half of the FACTORY 10 round magazine is a chunk of plastic serving as the floorplate for a short tube. No way to increase capacity.

A Pro-Mag reduced capacity magazine has some sort of indent or pin to limit capacity. That might could be gotten out, but bear in mind that if designed during the AWB 1994-2004 it had to pass BATF examination as "not readily convertible" to hold more than ten.

 

[Real Old Navy]

I smashed all my high capacity magazines already with a sledgehammer and threw them in the trash...honest officer!

 

[ScaryWoody]

After the Assault Weapons ban expired I was buying 10 round Glock 19 magazines for real cheap. Glock would swap my used 10 rounders for 15 rounders for free.

 

[Saudade]

The 10 round fullsize mags use the same metal body as the 1.0 Compact. Only the floor plates are different. No way to expand capacity back to 17 without some fancy fabrication. All of my FS mags are like this.

As others have said some manufacturers dimple the sides to restrict the follower. Some, like my Beretta 92 mags, bead the sides to reduce the stack so only 10 rounds fit. The benefit here is that you can disassemble the mags for cleaning and repair.

Some 3rd party suppliers internally block the mags with a dowel or other material that's epoxied into place. The base plate is usually riveted or pinned to prevent easy disassembly and conversion. This allows for restricted capacity mags when none are/were available from the OEM. It also allows people who move to restricted states to modify their mags rather than replace them. Sadly, this hampers the ability to clean/repair the mag.

Yes, I know this sounds dumb but terms like "permanent", "not readily convertible" and such are not defined in any code. Reliance on case law is a **** shoot at best (I won't be the test case).

 

[Rastoff]

The 10 round fullsize mags use the same metal body as the 1.0 Compact.

Sorry, but wrong. Here is a pic of a full size 10 round mag next to a compact with the base plate removed. As you can see, the bodies are different.

 

[Roller Delayed]

I don’t really get the 10rd limit. Why 10? If there had to be a limit for some states, it seems like 17 makes more sense, since that’s what most full size pistols are.

I blame base ten.

 

[Rastoff]

I don’t really get the 10rd limit. Why 10? If there had to be a limit for some states, it seems like 17 makes more sense, since that’s what most full size pistols are.

That is exactly the point. Because most pistols come with greater capacity, the 10 round limit is a "soft" gun ban. They make it more difficult for manufacturers to sell and that's part of the agenda.

 

[Saudade]

Sorry, but wrong. Here is a pic of a full size 10 round mag next to a compact with the base plate removed. As you can see, the bodies are different.

That's the .40 cal ones. Here are the 9mm.

Since the convo was about 17 vs 10, I assumed the discussion was around 9mm. Technically we're both right.

 

[spirit4earth]

Yes, I was curious about 9's.