And do I smile, such cordial light
Upon the Valley glow
It is as a Vesuvian face
Had let its pleasure through
And when at Night—Our good Day done
I guard My Master's Head
'Tis better than the Eider-Duck's
Deep Pillow—to have shared
To foe of His—I'm deadly foe
None stir the second time
On whom I lay a Yellow Eye
Or an emphatic Thumb
Though I than He—may longer live
He longer must—than I
For I have but the power to kill
Without—the power to die
The final stanza is mystifying in that it reverses much of what has gone before, a trajectory that doesn’t reach a desination. 
 The speaker/gun seems to long for the death that will eventually come to the “Owner”, but will never get because it is not human. 
 This line suggest that the speaker of the poem is immortal or of a higher power and not human
My Life had stood—a Loaded Gun