recommendations for mold material

[marlin60]

I have some liquid steel from Brownells with the intention of making a plug for my 19 round CZ 75 mags.

I plan to imbed the spring, and make the plug tall/deep/thick enough to limit magazine capacity to 10 rounds.

I've been using metal strips stuck to the back of the mag up to this point, but they do come 'unstuck' from time to time (I guess from being dropped repeatedly on gravel).

I can work with the epoxy, but I'm not sure what to use to make the plug.

Right now I'm thinking of cardboard, or cardboard/saran wrap etc.

Is cooking spray ok for a release agent?

It doesn't have to be perfect. If it fit into the bottom of the mag and filled even 60-70% of the diameter I'm sure it would work.

Anybody do something similar? How did you make your mold?

 

[45ACPKING]

only part of this i can answer 100% is .... yes.... cooking spray does work as a release agent..... PAM has more uses than just the kitchen hehehe

 

[maynard]

Make the plug out of UHMW and forget about dicking around with a mold.

 

[Can-down]

Where did you get the 19 round mags?
I agree with Maynard there has to be an easier way then imbedding the spring in epoxy...what if you need a new spring down the road?

 

[Canuck223]

I have some liquid steel from Brownells with the intention of making a plug for my 19 round CZ 75 mags.

I plan to imbed the spring, and make the plug tall/deep/thick enough to limit magazine capacity to 10 rounds.

I've been using metal strips stuck to the back of the mag up to this point, but they do come 'unstuck' from time to time (I guess from being dropped repeatedly on gravel).

I can work with the epoxy, but I'm not sure what to use to make the plug.

Right now I'm thinking of cardboard, or cardboard/saran wrap etc.

Is cooking spray ok for a release agent?

It doesn't have to be perfect. If it fit into the bottom of the mag and filled even 60-70% of the diameter I'm sure it would work.

Anybody do something similar? How did you make your mold?

Tread lightly. Take a close look at the regs on converted mags. IIRC, when Rob and Leon were busted, the method of conversion for some (STI?) mags came in to question. The Crown seemed to feel the wording of the act requires the plug or block to be made of a similar material as the mag itself. I believe they took issue to a plastic plug in a metal mag.

Perhaps WHYLOOK will jump in to correct my memory.

I think your plan is a good one, but it might not pass the sniff test if there is ever a problem. The issue will be "permanance" of the conversion, and as the mag can be restored to full capacity with just a replacement spring, it alone may not be enough.

Of course most of us who've been around long enough will recall, Glock blocked our mags exactly as you described after C-17.

 

[Can-down]

Ok, I think I get it now the plug will be attached to the spring and free to move inside the mag....

Auto body filler spreaders are cheap, and epoxy doesn't stick to them, you could cut one to size and wrap it with electrical tape to form the mold.

 

[maynard]

A gentleman down the road from me has a small museum that displays guns. Because of this, he had to have the Ont CFO himself come down and approve the site and storage facility.
He had several 9mm Hrowning Hi-power mags that that he needed blocked to show the CFO and get his approval. Of course he only showed him one to see if it met the standard. I made an aluminum block that fit inside the mag and used a 8-32 buttonhead screw to hold it in place through the floor plate of the mag. The CFO said since it needed a special tool (allen wrench) to remove it for cleaning, it was OK.

 

[marlin60]

Where did you get the 19 round mags?
I agree with Maynard there has to be an easier way then imbedding the spring in epoxy...what if you need a new spring down the road?

I have a spare just for this purpose.

Got them from the USA some time ago. They were riveted to ship. I epoxied metal strips on them, which is easy, but once a year it seems, the epoxy gives up. I don't need to get in trouble over a loose piece of metal.

I see the special tool need, so the change back is not 'too easy'. I'll have to look at this again to see if I can screw or rivet the metal inside the mag, but not have it interfere with the insertion of the mag (this appears to be a bit tricky).