この辺を歩くなら銃を持って歩け。

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

area; vicinity; region; side (of triangle, rectangle, etc.); circumstances

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to walk

be; is; indicates past or completed action; indicates light imperative

gun; rifle; small arms

to hold (in one's hand); to take; to carry; to possess; to have; to own; to maintain; to keep; to last; to be durable; to keep; to survive; to take charge of; to be in charge of