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What does UR stand for?

UR stands for Upper Receiver

This definition appears frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Other Resources:
We have 13 other meanings of UR in our Acronym Attic

Samples in periodicals archive:

The top rail was also redesigned so that when installed it creates one continuous Picatinny rail between the upper receiver and the handguard.
Colt has some ideas on the next generation of C7, in that the rifle could see a fully integrated upper receiver and a free floated barrel, which would make the rifle inherently more accurate.