Not a stupid question at all, magazine compatibility can be a little bit of a wild goose chase sometimes. I've looked on several sights and found the magazines that the MAK-22 takes (im assuming this is the one you purchased)
budsgunshop.com/product_info.php/products_id/35265 />------------
I can't find them in stock anywhere.
Out of stock right now at buds but if you hit the "notify me when available button, buds will email when they get more in stock.
budsgunshop.com/product_info.php/products_id/713079470 />-----------------
Available for backorder here
(Shipping ETA is unknown)
opticsplanet.com/armscor-precision-inc-rifle-magazine-22-long-rifle-mak47-22-10-round-55289.html

I found one site that list 15 rounders and 25 rd magazines in stock but whe. I hit "add to cart" nothing happens.
store004.gundealersusa.com/index.php?route=product/category&path=24&page=4
----------------
You might try contacting these guys and see if they actually have these
Address:
85 Main Street
Phoenicia, NY 12464
Telephone:
845-605-ARMS (2767)
Or
http://store004.gundealersusa.com/index.php?route=information/contact