UTG tri-rail bolts.

They are garbage. I managed to find some at work. I'm pretty sure they're metric and when you do get proper ones you'll have to enlarge the holes the heads are recessed into.

I wish I could tell you the exact size. There must be some kind of industrial fastener supply place near you. Take the barrel band with you and find something that threads in properly. Shorten them if needed.
 
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