The plot of the movie is technically to find Ray Brower's body beside the tacks, after all.The tracks represent the speed in which children become adults and that life becomes death and life again.
To find Ray Brower is to prove that they have purpose, that they matter.
This is their chance to be the town heroes, instead of the town "losers." The gun is a universal symbol for danger and the masculine realm.
The text very clearly defines these boys, and shows several examples of their roles and how it plays out on their voyage.
At one point, Teddy foolishly attempts to dodge a train, but Gordie jumps in and tears him away.
The train on its own could arguably represent death, being the thing that knocks Ray Brower out of his Keds.
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Within the group, the boys acknowlegde the train before removing themselves from the tracks.
Even though their parent's take the credit for Denny and shower him with attention and affection, while ignoring their more introverted younger son, Denny tried to make his parents see Gordon and to appreciate his talent for writing.
The older gang (Ace, specifically), takes Gordon's hat, even though they know it was Denny's.
When Chris assures Gordie it's not, he pulls the trigger and a bullet hits a garbage can.
They get away quickly, and luckily, a nearby wailtress only thought it was a cherry bomb.