Engineers Can I use two different and varying grades constructively?

[Sevenperry]

Hardly been able to play recently. Visited the dweller and got some mods on beam lasers and distributor. I've done grade 2 on distributor with shields, so can I do a differing grade 1 mod on it, constructively or will it overwrite and nullify the previous grade 2.
I'm guessing I'll keep my present improvements but just from that level adjustments will be made. Can two different grade 1s be applied then yet a further different grade 2 be done. Not been in game much and still aren't!

Just asking....thanks

 

[sndle9]

Hardly been able to play recently. Visited the dweller and got some mods on beam lasers and distributor. I've done grade 2 on distributor with shields, so can I do a differing grade 1 mod on it, constructively or will it overwrite and nullify the previous grade 2.
I'm guessing I'll keep my present improvements but just from that level adjustments will be made. Can two different grade 1s be applied then yet a further different grade 2 be done. Not been in game much and still aren't!

Just asking....thanks

Mods do NOT stack.
.
You can mod a previously modded component, but it will totally overwrite the previous one if you accept it.

 

[Sevenperry]

Mods do NOT stack.
.
You can mod a previously modded component, but it will totally overwrite the previous one if you accept it.

So if I get a great grade 1 roll it doesn't effect the base of a grade 2 roll of the same mod type? If I change to another mod type on the same component, I loose my previous gain? Oh harsh.