— Here in the last stanza the narrator describes the woods using three adjectives – lovely, dark and deep. This indicates that he is enjoying the scene and wants to do so for long. But he has other responsibilities in life. He has to go a long way before he sleeps. So he cannot get the enjoyment for long. He has to move on. And the important thing here is that the poet repeats the last line to attract the attention of the readers. In this very last line lies the allegorical interpretation. Here “sleep” may refer to death. We, in our real life, have many things to look at with awe, many things to enjoy, but in most cases we cannot simply because we have other things to do in our short lifespan, so we have to move on.
The AR-15′s .223 bullet is very light. Its strength is velocity. Despite the mass shootings where they have been used at close range, their real strength is not close quarters but shooting distant targets, especially in target shooting competitions. Because of its high velocity, it is affected less by wind and gravity. You can see in the graphic below that the lower velocity ×39 bullet (yellow – used by the AK-47 and a number of other rifles) falls more quickly and is pushed further to the right by a crosswind than the AR-15′s .223 round (red).