1) The BitGun level is on the lowest and therefore the reward is also the lowest possible
What does it mean? What is this indicator of BitGun? I see this for the first time. Maybe you mean the ROI indicator?
BitGun is the name of a system they've developed which controls the amount of generated coins in order to support the price. The name is taken from the person who incepted it Gunbit.
Full discretion can be found here:
https://xdna.io/bitgunIn short, the higher the hashrate the more coins are generate in every block, increasing the reward for Masternode holders and helping the GPU miners keep a steady reward. Right now the price has fallen to record lows and miners have left, therefore the GunBit level is 1 and the reward per block are the lowest possible, which will slowly help stabilize the price.