Easily done once you've completed or started Chapter 6: The Pit. If you've already finished this section I recommend going to chapter select and starting it on Walk on the Beach difficulty.
Note: Chapter select asks you which of 4 separate save slots you wish to use, so you can save to an empty slot without tampering with your current progress.
Once you start, immediately run to the right where there will be a shotgun with a dozen or so rounds as well as grenades. You can use the grenades to kick up dust, blinding the men and forcing them to stand still, however it's not necessary due to the close quarters.
There is a shipping container next to the wall where you find the shotgun, about 3 enemies drop off here and are easily blind fire killed. The other end of the enclosure flanks 2-3 guys depending on how quick you are. It's also easy to get Blind Luck here, as blind firing with the shotgun in such tight spaces is a guaranteed kill.