no they are for the BullPup ONLY see *******Black Aces Tactical Shotgun Magazine 2-Pack features
Steel Construction
These are for the Black Aces Bullpup Series
Polymer floor plate and follower
Bolt catch tab
10 Round capacity
Caliber 12ga 2.75"-3"
2 pack of 10 round mags
*****Only for Bullpup Shotguns does NOT fit other models
New production 10 Round magazines are made specifically for your Black Aces Tactical Bullpup shotgun. Get that factory fit and function with these new magazines. Does NOT work in the Black Aces M series. Please Note: There may be cosmetic differences from mag to mag, Sides may be solid or slotted no choice offered.
This is a 2 pack of 10 round mags.
Here is the 10 round mag for the pro m shotgun https://blackacestactical.com/product/saiga-style-10-round-magazine-copy/

Hi Vernell , no this will not work with the Pro M 12 gauge. You want this one >>> https://blackacestactical.com/product/saiga-style-10-round-magazine-copy/
Stay safe & have a great day!

Hi Vernell and welcome. No Sir, you will need these magazines : https://blackacestactical.com/product/saiga-style-10-round-magazine-copy/ ----- Cheers and stay safe!