Do aftermarket 2 round magazine extensions, like this:

S&W M&P Shield Magazine Extension +2 Rounds 9mm / .40 Cal - Mag Base Grip +Plus2 | eBay

work in the 8 round mags, or only in the 7 round mags?

Thanks in advance.

When I had a regular Shield, I used these: Base Pad For S&W M&P Shield 9/40 OEM Magazines - Taran Tactical Innovations

And they only worked on the 8 round 9mm mags....

Looking at the pic of the extension, looks like only the 7 round. See the slot where the mag body slides? That would then leave the gap that the spacer on the 8 round mags fill. I guess you could still use the spacer but don't know who well it will blend in the contours.

If you look closely at the Taran Tactical, the groove is closer to the bottom of the pad so no spacer needed.

Another option is Magguts.com.

Shield

I've used the Magguts +2 in 8 rounders.
They've been flawless and add very little to the length.

Smith & Wesson Shield 9mm +2 MagGuts

I have XTech Tactical +2 on my 8 round Shield 9mm mags. I did not try on the 7 round mags. They work well. I have a different extension of my 40 Shield mags. Called E.M.P. Enhanced Magazine Plate. It adds 1 round to the 40 Shield mags. Box says it adds +2 to the 9mm mag. I plan to try one to see if it works.

I have the MagGuts +2's in both the 7 and 8 rounders that came with my Gen 1 Shield. They have functioned as well with those as they did at the stock capacity. I carry it with the shorter mag for a 9+1 and can carry a spare with 10 rounds. At that capacity I never felt the need to go with a Shield Plus. If I think I might be more comfortable with more ammo than the Shield offers with the extensions, I just carry a bigger gun.

Thankis, everyone.

With the aftermarket 2 round magazine extensions, have you had any problems with the magazines feeding all 10 rounds and/or durability?

Just buy a Shield Plus. You can thank me afterwards.

I would if I could, but I'm in California and only the Shield 1.0 is on the roster.

Yea, that is what I ended up doing in the end. And, I sold my original Shields.

I have 3 Shield Pluses now

The Taran Tactical +2 ones (for the Shield) worked 100% for me. I use them now in another brand of gun too

The EMP is made by Strike Industries. It added a couple rounds to my 7rd and 8rd Gen 1, 9mm magazines. They looked a lot like the ones in the OP’s picture. They worked great and the price was right.

Wdbutcher97, thanks.

Where did you buy the Strike Industries EMP?

I’ve been using the XTech +2 and been very happy, haven’t had a malfunction in the year + I’ve been using them.

You can buy them through the Strike Industries website or MidwayUSA. I'm sure there are more places they can be purchased. I bought mine at my LGS years ago.

Attached Images

Screenshot 2023-07-15 at 20-38-35 Strike Industries EMP Enhanced Mag Plate Mag Base Pad S&W M&P .jpg (25.9 KB, 21 views)

Just bear in mind,

From the SI site:

"NOTE: Made for 7 round 9mm magazines and 6 round .40 cal magazines. The EMP+2 WILL work on the larger capacity factory magazines but with a noticeable gap between the EMP and pistol grip. The factory spacer will not fit flush with the EMP without slight modification. "

BTW, the ebay ones you first posted bear a remarkable similarity to the SI ones.

I have never heard of anyone having issues with magguts +2. So I personally would go with that brand. YMMV

I would go with Taran or Hyvee if you are wanting a 2 round extension for the 8 round mags. Ive got plenty of rounds through my Hyvees and they are great. Never used the Tarans, but they are highly regarded in the industry.