Hi Bruce, This will accept any AR12 or MKA 1919 style magazine or drum.
10rd magazine here budsgunshop.com/product_info.php/products_id/127318/sds+imports+t10rdm+replacement+magazine+12+gauge+sds+imports+10rd+black+detachable ,
.
15rd drum here budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+2.75+15rd+drum ,
.
20rd drum here budsgunshop.com/product_info.php/products_id/145716/black+river+12+gauge+20+round+rd+drum+magazine+1919+shotgun+black+red ,
.
30rd drum here budsgunshop.com/product_info.php/products_id/411561311/black+river+12+gauge+30+round+rd+drum+magazine+1919+shotgun+black+red ,
.
19rd magazine herebudsgunshop.com/product_info.php/products_id/114563/rock+island+vr+12+gauge+vr+19rd+black+detachable ,
.
5rd mag here budsgunshop.com/product_info.php/products_id/128768/ati+atim12bd5+bulldog+12+gauge+5rd+detachable ,
.
Stay safe & have a great day!

10rd, 15rd and 20rd magazine and drums here: budsgunshop.com/product_info.php/products_id/127318/sds+imports+t10rdm+replacement+magazine+12+gauge+sds+imports+10rd+black+detachable ----------------------------------------------------------------- budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+2.75+15rd+drum -------------------------------------------------------------- budsgunshop.com/product_info.php/products_id/145716/typhoon+defense+brdmbk02+drum+magazine+black+%26+red+20rd+12+ga+for+typhoon+defense+x12+f12 ------

Hi Bruce and welcome. Yes Sir, 10rd, 15rd and 20rd magazine and drums here: budsgunshop.com/product_info.php/products_id/127318/sds+imports+t10rdm+replacement+magazine+12+gauge+sds+imports+10rd+black+detachable ----------------------------------------------------------------- budsgunshop.com/product_info.php/products_id/714025798/promag+mka+1919+12ga+2.75+15rd+drum -------------------------------------------------------------- budsgunshop.com/product_info.php/products_id/145716/typhoon+defense+brdmbk02+drum+magazine+black+%26+red+20rd+12+ga+for+typhoon+defense+x12+f12 ----------- Cheers, stay safe and enjoy!

Good evening to you!! Higher capacity magazines and drums can be found on Bud's website. Please see below link. The magazine and drum are of a MKA1919 series. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'merica' 🇺🇸 🇺🇸
budsgunshop.com/search.php/q/mka+1919+magazine

Yes, here's a 20 round drum below.
budsgunshop.com/product_info.php/products_id/178998/gforce+arms+12+gauge+20-rd+drum+magazine

Hello Bruce, yes they have higher capacity magazines available. You can use any MKA-1919 magazine. Available here: https://gunmagwarehouse.com/magfinder/gforce-arms-gf-series-12-gauge Hope this helps and have a great day!