how do I keep the bolt stop pin from falling out of the bm 59?

[Justinian K]

Hello i'm new to the form and i have built my own bm59 and was wondering how to keep the bolt stop pin from falling out i know that on the m1 its the stock that holds it in. so how does one stop it from moving?

[Punch The Clown]

Replace the pin with one from an M16/AR15. The "C" clip will hold it in place