From a TX Store Closing: 2 have prong and one is a slip through - from a gun store closing - new and  in ready to use condition.  

I am not an expert on these and therefore prone to occasional mistakes so please judge the item by its photos.  I try to get one from every angle I can.  Please contact me if you have questions.  

We will ship to continental US and elsewhere if arrangements are made prior to purchase.  I will also bundle items to help with shipping costs.  Thank you for looking!  Good luck.