Hi Waff, yes they are rare, i think just as rare as the 4,2 cm i know 4 rounds of the 7,5 cm pak 41, 2 i have, the only one that i am missing is the 7,5 cm Pak 41 HE, but i think i will get one from the US, i know that in the US there are some more Pak 41, but very very hard to get them out., Cheers Ben