MK-33
From Memory Alpha, the free Star Trek reference
An MK-33 was a projectile weapon used in the 21st century.
The founders of the Terra Nova colony had weapons resembling MK-33s when they founded the colony in 2078. In 2151, the descendants of the colony were still using the weapons – Athan used one, but Lt. Malcolm Reed wasn't sure if it was an MK-33 or an MK-34. (ENT: "Terra Nova")
- MK-33s may have still been in use in the mid-22nd century, but Reed referred to them as "old," so they were likely outdated by the time of Enterprise's visit.
