Hey guys. I just got a Technisub Ranger speargun. I don't really know anything about spearguns and I am wondering what the best way is to test it. How many pumps is safe, and is it ok to fire it out of water? It belonged to a relative who passed away and his wife want's me to sell it for her. So, I would like to find out if it is working good before I try and sell it. Thanks for any info!