Not really, no. Especially if you use barrel-less electromagnetic designs. The Navy is testing a rail gun that fires 3.2 kg at 9k kph.
Again, it's the acceleration and heating on the projectile that I would worry about. Then again, I think Project HARP found that electronics survived the firing better than they expected in their fairly crude sand and epoxy suspensions.
One strategy would be to conventionally launch a big satellite factory robot with the most fragile parts (fuel, solar cels, glass instruments, ...) and then do cheap gun launches with the more durable parts at your leisure.
Again, it's the acceleration and heating on the projectile that I would worry about. Then again, I think Project HARP found that electronics survived the firing better than they expected in their fairly crude sand and epoxy suspensions.
One strategy would be to conventionally launch a big satellite factory robot with the most fragile parts (fuel, solar cels, glass instruments, ...) and then do cheap gun launches with the more durable parts at your leisure.