This video shows instructions on how to custom fit a CMMG BHOA (Bolt Hold Open Actuator) in to a upper receiver.
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Im all for full auto fun. but i cant see myself doing it with a .22 . may be fun for kids and small women.
still getting nowhere with the bhoa + evo mags even with spring change and file fitting , I believe you can grind your bolt and that works . Don't think I will try that .
the spring that comes with the kit is to replace your factory bolt release spring with a lighter one.
Just got a bhoa with the new EVO mags , and no matter what the bolt wont close fully until I ease the mag back out .
My magazine will not seat with the bhoa in?
I would like to know what the extras are for as well. The instructions say something about adjusting the allen screw but nothing about the spring.