Who makes the best adjustable gas block ? How do you adjust them? What are the styles they come in? Why so many questions ?, There was a gentleman that recommended one for controlling cyclic rate with the application of heavy grain bullets , rather than a bolt carrier system ,or replacing the bolt buffer,i  It sounded like a great idea , kind of like what you would do for the FAL in tuning it for accuracy by adjusting its gas block , does this sound good to youall or am I just grabbing at straws? THANKS for any help you can provide!