The Tek 4 is nearly identical in practice to the newer Rogue; they both are small, spring-powered blasters with 4-dart manual turrets. They also both get similar ranges; the Rogue gets 30' and the Tek 4 gets 25', although it's older and came from a thrift store. The major difference is the priming method; the Rogue has a sliding prime while the Tek 4 has a pull back prime.
One of the most interesting features of the Tek 4 is the plunger rod; it's nothing more than a thin metal rod. This is the only blaster that I know of that uses this kind of plunger rod, making it unique. The plunger head itself is akin to a super-extended SNAP plunger head, which is also very uncommon. This makes the Tek 4 an interesting blaster, if not a very good one.