i got a level 7 mag, i was thinkin of buyin a used boo-yaah trigger, wat needs to be bought to get it to work, cause i've heard the selnoid can't push the on/off so u need a new 1, is it true, explain

and if i buy a brand nem mako frame is the selnoid fixed (from pussy boo-yaah selnoid to a selnoid strong enough to push the on/off pin)