I know ruger will never  sell any mags over 10rd mags to us. I know others make 30rd mags for the 9mm I want some 20-30 rds for my pc 4 (40 auto ) have some 11rds mags. any ideas on how to make some like cuting a reg mag body an cut the top off a tommy gun mag or h&k mag and make my own. I got a hell of a deal on this rifle so i would like to make it work out may sell it an buy a 9 mm upper for a ar or buy a h&K 94  this is my under the bed gun added flash light and red dot  and vertal mag pouch on butstock like a m1 carbin ty for help

I think they use the P series mags.  Don't know what the largest mag ruger made for their .40 pistols.

yes p series mags the preban mag are only 11 rds