My problem was the M5 bolt they supply with was too long for bullet out setup(belt housing not flushing fit to mag housing)
But acctual road block was nut in the part that goes to belt(belt housing?) was making bolt to stop midway for M5 bolt to go through all the way.
If you muscle it little( it won't break like I feared little) to pre-fit bolt to go through all the way(more like mid way) before assemble, you can sit belt housing to flush.
I wouldn't do it too much to fit loosely thinking so it doen't get loose over time.
I didn't drill a hole on opposite side just in case I had to return.
So if you are not planning to return, drill a hole as per instruction so you can have a better leverage to screw the bolt in.
