Step 9: Put some time into you're guns
Look at my rifle and battle bot. The battle bot works by having the motor pull the ram back and then release it. That took me around 2 weeks to get the system to work OK. 3 days on the hopper and the barrel, and 1-2 days getting max power out of it and perfecting the system. Thats 2 weeks 5 days. and since were on the topic of time:
my rifle = 2 months
the_burrito_master's sniper =4 months.
oodalumps' semi-auto rifle = month or two.
mepains inferno = 9 MONTHS!