5.56 Ammo box with sliding lid that holds 50 rounds.
If the tray doesn't fit snug: Place a drop of superglue on each post and then press the tray onto the posts. Let the glue fully dry and before placing ammo inside, or before sliding the lid on. This is to prevent any superglue residue or “bloom” from getting on your ammo and lid.
If you'd rather have a traditional case and lid click here.
Ive printed at both 0.28 and 0.20 layer heights without issue.