...prior to 4th ed, there was no need (nor way) for a smartlinked gun to talk to the matrix, or for that matter, cyber implants and most other gear (save for cyberdecks, telecom units, and simsense decks). All the bonuses offered were granted completely through their internal systems and sensors as it was not a "wireless world" back then. The only "wireless" comm (phones transceivers, radios, etc.) was over radio or cell frequencies which were separate from the Matrix. A Commlink back then was nothing more than an implanted frequency scanner that assisted with the use of other implanted comm gear. Other than this, everything was "hardwired", and therefore, it's own self contained independent system. The only way to gain access from outside, would be to physically jack into the item or implant or person's datakack.
Archaic in comparison to "today's" (the 2070s) wireless world? Yes, but still very functional. Systems from (or designed and built on the principles of) Pre Crash 2 era tech are what are termed "throwbacks" in the current game world. By logic, they should function just as well as their wireless counterparts, granting their full bonus for whatever task they are designed for without the need for involving the Matrix "cloud".