It was just a tubular steel roll cage covered with "heavy gauge" steel. I seriously doubt the standard XR311 could stop a .50 cal. Though if you wanted, you could say that it is laminated with resistweave to give it an AC of 35.
In 4th edition, the XR311 only has an AR of 20B, 40NB and 640EX. So you could just use the 20B for the AC if you wanted.
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