I use Zelle and Apple Pay as Venmo and Paypal have locked my accounts for selling scopes....which I was able to sell on Ebay(owns Paypal) with no issues and of course they make you use PayPal for payment.
As mentioned, there is no buyer protection with Zelle but to be honest, Paypal would not have paid on a claim involving firearm-related items anyways. On top of that, when using Paypal, there is no seller protection. I won't go into details but there are 2 very easy ways for someone to shaft the seller in a transaction when using Paypal.
USPS MO are generally a good idea, you can easily see if they are fake or real, depending on the amount and your post office you can cash them at the post office.
In the end, due diligence is your friend. If a deal is too good to be true, scrutinize it a bit more.
Red flags:
-New members with low post count
-New members with normal or high post counts in a short amount of time
-Seller wants to switch to email communications vs PM
-Messages with odd or incorrect use of the English language(its sometimes subtle)
-Seller refers to the item in question as "the item" instead of scope, rifle, binos etc
-A PM when you have an active "WTB" thread where someone directs you to his "friend" that has what youre looking for and provides an email address
What you can do
-Ask for pictures with your screenname written on a piece paper in the same phots as the item in question
-Pm other memebers who have possibly made a deal with the seller and an inquire as to how the transaction went
-Possibly ask to speak over the phone
-Use Google to check email and names to see if they show up anywhere in a negative manner
Those aren't foolproof, but they paint a picture to work with. I recently busted a scammer here that was the best scam play I’ve seen yet, and verifying details such as the official
Southern Bank customer service number actually helped me catch some inconsistencies. It was well done including some fancy photo manipulation to try and pass my screenname picture test....almost worked.
In the end, go with your gut unless you can afford to risk the money in question.