here's a decision tree
1) the first thing to ask, Is collection possible? (even if you're too far to collect)
-> no, STOP - if they can't meet is a scam
-> yes, proceed to next step
2) "actually I think is a bit too far for me to collect, if you'd post it to me, could I pay you by PayPal?
-> No, ask why
-> yes, just go ahead, paypal is on the buyer side 100% of the times, you just need to open a claim saying "item not as described" and the seller automatically lost.
-> If they say yes, but prefer bank transfer, ask them to provide feedback of previous transactions, then decide whether you're willing to proceed or not, even with bank transfer, you can request a charge back if you're buying something online and is not as described, some cards like Revolut have purchase protection, and return protection, if seller doesn't take it back you can open a claim with there insurance.
Me personally as a seller, I rarely accept PayPal for rifs, the average pistol I build and sell is £500, rifles can go up to £1.5K, if you're an individual and not a shop, is a lot of money to risk through PayPal.
Paypal also doesn't offer protection or airsoft purchases I think, another reason why buyers always win claims.