Shell Factory - ALL Tiers - Fully Proliferated - 11/s
This shell factory will produce 11 per second of ALL shell types - MK 1, 2, & 3! It is fully proliferated (gives 15 shots each vs. 12), tech friendly (makes whatever tier you have unlocked), and assumes a reasonable production rate.
Also check out my highly rated "Double Stacked Bus Mall - Complete": Available HERE!!