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Discussion Starter · #1 · (Edited)
When SIG produced their .22 conversion kit for the p220, p226 & p228/p229, they made the magazine compliant with all states, limiting it to 10-round capacity. For us in 'non-socialist America', that just isn't sufficient.

There's a company selling a replacement for the factory magazine plug (for $4.95 + shipping) which increases capacity to 15 rounds. It is very well made from machined aluminum (where the factory one is ABS plastic), but modifying the original plug to achieve the same result is a simple matter. I've done to two magazine plugs and they work just fine.

My intention isn't to curtail profits for this business, but if I'm spending less on modifications I can put it toward ammo and shoot more!

If anyone is interested, reply and I'll post some images and instructions.
 

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I looked into a replacement follower that would increase capacity, but it stated that slide lock back after the last round would no longer work. I decided against the change because dry firing after each mag load (it's either keep pulling the trigger until it no longer goes bang or count rounds) would not be good for the firing pin in a rimfire pistol.
 

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I looked into a replacement follower that would increase capacity, but it stated that slide lock back after the last round would no longer work. I decided against the change because dry firing after each mag load (it's either keep pulling the trigger until it no longer goes bang or count rounds) would not be good for the firing pin in a rimfire pistol.
I am confused. The stock Sig p226-22 magazines when used with the Sig p226-22 conversion DO NOT provide any last round hold. What does your comment mean?
 

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I am confused. The stock Sig p226-22 magazines when used with the Sig p226-22 conversion DO NOT provide any last round hold. What does your comment mean?
I was unaware of that. I have a FireFly (Mosquito) and it locks back after every last round. It would no longer do that if I put in one of the followers that increased the capacity, per the manufacturer of the follower.
 

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Discussion Starter · #6 · (Edited)
How to modify original plug -

NOTE: This works on magazines made for the p226 AND p228/p229 - it allows a 15 round capacity.

FYI: My SIG .22 conversion kit for the p228 works fine with the Federal Premium庐 Champion .22 LR 40-Grain Rimfire Ammunition @1,200 fps - no FTF, no FTE (unless limp-wristed) - since I can find it at our local Academy Sports for $18.99 for 325 rounds, I see no reason to spend more just to punch holes in paper.
UPDATE: 05-12-2018 - Federal must have changed their load for the 40 gr. RNL because they are no longer dependable - I've switched to the Blazer 40 gr.RNL and had no issues, plus they are less expensive (17.99/500 thru targetsportsusa.com).
 

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Discussion Starter · #7 · (Edited)
TUKATZ - If you're concerned with dry firing when the magazine is empty, a grey plastic drywall anchor for #8 screws might work as a snap cap. Load it first in the magazine (the last round)...I've never tried it, but might be worth a shot. (No pun intended)
 

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flwing, very informative, I don't have one, but I do have a question. Instead of glueing the halves together, would it be sturdier just to chuck it into a variable speed drill, and using a small file shorten it, and create the spring mounting "nub"?
 
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Discussion Starter · #11 · (Edited)
Good question, Willard - I wasn't certain if the factory plug was solid or hollow. When I cut the first one I saw it was solid so I just decided to glue.

To answer you, "yes", that would work. Since I only had two to make, gluing worked - if I had more, I'd probably use a lathe and mill something out of aluminum stock (not worth the time for set-up to just do two) rather than even messing with modifying the original. I already have 5 magazines, so don't think I'll be buying any more soon, especially with SIG charging $28.75 each (on-sale price - normally $44.00!).

I thought about using a VSD, but was concerned tightening the chuck might damage the shaft of the original ABS (?) plastic plug.
 

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TUKATZ - If you're concerned with dry firing when the magazine is empty, a grey plastic drywall anchor for #8 screws might work as a snap cap. Load it first in the magazine (the last round)...I've never tried it, but might be worth a shot. (No pun intended)
Thanks. That would not help when I am shooting live rounds and the mag becomes empty. My FireFly came with a "snap cap" and I have used it to dry fire. Fortunately, mine locks open after the last round every time. I know a lot of people gave the Mosquito a bad name, but I really enjoy my FireFly. I shoot only CCI Mini Mags and Browning BPRs, both round nose and hollow point. The high velocity ammo works very well, with only a rare FTE or FTF.
 
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Discussion Starter · #13 · (Edited)
Have you tried the Federal 40 gr. target loads? They're 1200 fps, a lot cheaper and work fine in my p228 conversion.

UPDATE (04-16-2018): Probably due to different manufacturing lots, I've found the Federals I'd purchased recently are 'iffy' on FTE/FTF - recently have gotten a lot of low power loads. (I'll let my grandson shoot them in his bolt-action rifle)
I did find the Blazer 40 gr. made by CCI/Speer has been much more dependable. Recently bought 2,500 rounds for $99.95 (free shipping) at Palmetto State Armory - that's less than 4 cents a round.
 

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I have not tried those, but the price per round at Bass Pro Shops is about the same as for Browning BPR 40 gr round nose - about 6.5 cents per round.
 
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It would be nice if there was an aftermarket mag that did lock back!
There is - gsdesign makes them. I have 2 and they work as intended, locks the slide back after the last round. If you buy some, I suggest you get the little loader that slides down the mag because I find the spring to be very stiff when loading.
 

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Didn't work on my 226 conversion. Seems it only likes MiniMags :)
My p226-22 conversion works great with CCI mini mags and Remington Golden ammo. I have also been able to run the CCI Standard Velocity "blue box" ammo without any issues. In theory the "standard velocity" CCI ammo should not work - but it does.
 

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There is - gsdesign makes them. I have 2 and they work as intended, locks the slide back after the last round. If you buy some, I suggest you get the little loader that slides down the mag because I find the spring to be very stiff when loading.
As I recall those magazines that will lock back are made in Canada. When I looked at buying a couple I found that with frt and import duties they would cost about $100 each. I did not pursue.
 

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As I recall those magazines that will lock back are made in Canada. When I looked at buying a couple I found that with frt and import duties they would cost about $100 each. I did not pursue.
It's not clear if the prices quoted on their website are in CDN or US $'s. So, I sent them an email to check the price including delivery and tariffs, if any.
 
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