Not compatible with all ruger pcc models! - Magpul Industries PC Backpacker Stock for Ruger PC Carbine

It says on the box that it is compatible with all Ruger PCC models, but this is NOT true. I have the 9mm Ruger PCC with the long M-Lok hand guard and the rifle stock. I called Magpul to ask how to put the hand guard on my model, and he said it's not compatible with that model because Ruger won't sell the needed mounting block. I called Ruger and asked if I could order the other takedown mounting block and they said that part is not for sale! Very unfortunate. I returned it to Optics Planet and they gave me a full refund and even paid for return shipping. So before you buy make sure it will work with your model of Ruger PCC.