Here is a link to Pro Mag listing on Natchez Shooters Supply Website that shows they sell a 30 round poly mag for 995 Carbine.
HIPONT 995CARBINE 9MM 30RD POLY
Product Number: ZMHIPA2
Product Title: HIPONT 995CARBINE 9MM 30RD POLY
Item Price: $37.88
Availability: Currently Out of Stock, click the alert icon to be notified when product is available.
Shipping Weight: 0.00 lb.
Due to demand, we are limiting the number of magazines that can be purchased to allow everyone the opportunity to purchase.
Seems like it would be one hell of a contraption if it did exist.
I cant imagine how they would attach the drum into the pistol grip.
Just an extra extra long vertical feed tube but I dont know. If I had a 30 rnd drum I think I would go through ammo a lot quicker. And its quick as it is. I dont think Id want that.
"To remove guns from the hands of law abider's is the tyrant's dream, the criminal's dream, the warmonger's dream; and it is the law abider's nightmare."