Not quite true.

I dont know about the SRA's in the east. It may be the case there but out here in the west, rifles are allowed in that part of 2B that is outside of Allegheny County. We were all surprised when the PGC created the new WMU's that they didnt do that(restrict it to shotguns) but they didn't. The fact remains, however, that rifles are legal weapons in some of 2B. All of which is an SRA.