Glad you mentioned that, I had a PP account years ago but have ceased using them due to the changes made over the years. Went back to read the TOS and Paypal has this in the prohibited area: (j) ammunition, firearms, or certain firearm parts or accessories, or (k) certain weapons or knives regulated under applicable law.
https://www.paypal.com/us/webapps/mp...ptableuse-full
For supporters of Knife Rights and the 2A, I would not choose Paypal either.
They will seize funds if they are aware of the transaction. My banker relayed to me how much a PITA Paypal can be if there is a problem.