Oops, they say they are for egrips, but they look like they would work.

New Trigger for the A5 Egrip - Special Ops Forum

Yes, the double red drive spring works well, but the drive spring on the sear plus the double trigger spring.... Well, it either didn't work, or the pull was too hard.

I tried to pull the trigger but the marker didn't fire. I could have pulled harder, but didn't want to break anything.