Rules, not a duplication guide
Do mods stack?
Yes, the same effect can fire more than once. Game Informer’s 1.0 review called the stacking “a unique mod-stacking mechanic that can double or triple effectiveness.” The achievement Repeat a module to 4 or more executions (global 0.40% on 6 Nov 2026) shows four is a real in-game target, not a rumor.
If you searched “two sensitivity weapon damage corruption mods do they stack,” the split is below. Same source, another source, a chassis effect, and a corrupted module are four different cases. I do not publish steps for any duplication glitch. I could not find a 1.0-era report I trust, and this page will not become a how-to.

| Case | What the notes support | Status |
|---|---|---|
| Repeater | Repeats the effect in a neighboring slot | 1 source |
| Resonator | Strengthens a nearby slot | 1 source |
| Invoker | Opens a neighboring slot that started locked | 1 source |
| Chassis | From Hard Reset, chassis effects can show on the mod screen and some can be repeated | 1 source |
| Four executions | Achievement text: repeat a module to 4 or more executions | 1 source |
| Duplication glitch | No dated 1.0 report located in the public discussions checked. | No public report located |

FAQ
Do two copies of the same damage mod stack?
The achievement and the review both say one effect can run more than once. They do not publish a per-mod cap besides the “4 or more” achievement line.
Where is the dupe glitch?
Not on this site. I have no dated 1.0 source for a working duplication trick, so there is no procedure to copy.