it's called a parapet and you are wrong past me.
There are multiple definitions for the word parapet. The more common one is a short wall that protects, or the raised borders of a structure, such as a balcony. The less common definition is a defensive wall that protects soldiers from attack.
It may be called a 'parapet' or a 'pony wall'
The serial number does not determine if it is a high-wall or a low-wall. The caliber, barrel size & length, and the style of the receiver frame determine the answer to your question.
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Parapet
It may be called a 'parapet' or a 'pony wall'