They're coming

That's good to hear @Freak Show
I haven't gotten an e-mail from them yet & hope too
Today while at a fairly large gun shop their inventory of magazines was huge but had only one Springfield magazine & it was a 13 round Hellcat magazine
I ordered two 11 round magazines from Omaha Outdoors via Gunbroker because their price was $20ea instead of $35+ea
That will give me one of each size + whatever SA sends with the "Gear Up" package

Kiss Rock & Roll Over, good choice. Baby Driver is a favorite of mine from there. I am about to find the 13rd and 15rd mags for the original Hellcat all around here, but nothing for the Pro. Since being new to this particular firearm, does the 15rd mag for the HellCat fit on the Pro? I know it has the grip sleeve on it, can it be removed to fit the Pro?

Freak Show said:

Kiss Rock & Roll Over, good choice. Baby Driver is a favorite of mine from there. I am about to find the 13rd and 15rd mags for the original Hellcat all around here, but nothing for the Pro. Since being new to this particular firearm, does the 15rd mag for the HellCat fit on the Pro? I know it has the grip sleeve on it, can it be removed to fit the Pro?

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Yeah Baby Driver = Peter Criss singing that one, "Go Baby Driver been drivin on down the road" OOh what a rider, Push that pedal to the floor YEAH!

I thought the same thing but without a pro to try it I don't know
You might take your Pro to the gunshop with the 15 round Hellcat magazine & see if they will let you try? Could be the same & bet it is...
The sleeve does pull right off
In fact, I saw a video on youtube where a guy took the +2 part of a 13 round hellcat magazine & used the spacer + the 15 round magazines tube and made a 17 rounder???
This would have also left the rest to be a flush fit 11 round magazine, I might try it JUST BECAUSE...
The "New" 17 Round Magazine for the Springfield Hellcat? - Bing video

Freak Show said:

I am about to find the 13rd and 15rd mags for the original Hellcat all around here, but nothing for the Pro. Since being new to this particular firearm, does the 15rd mag for the HellCat fit on the Pro? I know it has the grip sleeve on it, can it be removed to fit the Pro?

Click to expand...

I just came from the Local Gun Shop ECC, they had a pro & a FDE Hellcat with the three magazines & I had to try it out being it was just discussed
YES, the 15-round magazine for the Hellcat minus the grip sleeve is exactly the same as the Pro's 15 rounder
I showed the owner & he learned something too, because he has the 15 round magazines & now has the Pro, so that info will help him too selling magazines for the Pro
Great Question
They closed at 6:00pm & it's 6:18 now

Didn't see anything that tickled my fancy, Prices are sky high on everything even the used gear