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There are lots of options .
#1 : Building construction??
#2: Calibers to be fired.
#3: open to public or controled group.
#4: ceiling & roof material.
#5: bullet retension behind the firing line.
After you have gathered this info you can then look at different bullet retension materials. I have all of them save in files if you need them.
I have been to many ranges , worked with 3 , and attended the NRA gun range building and mantinence seminar.
Depending on caliber depends on material used to stop bullets.
Any bullet to leave the building is your resopnsability as the building owner and the responsibility of the shooter as well.
After that EPA is your enemy.
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