First, what kind of spring did you use in the stampede?
My build: Everbilt 24.80lb.
Recommendation: SGnerf spring.
What is the voltage in the stampede and swarmfire?
My build: 19.2v from 16 cells Ni-MH for both.
Recommendation: 12 cells (14.4v) or 4s Li-ion/Li-po (14.8v) to match SGnerf spring.
Are the triggers to the swarmfire and stampede linked or separate?
My build: Separate.
Recommendation: Separate. Linked (meaning adding a switch to the pede trigger) just makes the gun cumbersome to switch from swarmfire to stampede, because you have to simultaneously disable the pede and turn on the swarmfire to use it. You can wire the safety to do such a thing if you wanted, but it's more flexible to have 2 triggers.
Don't make the mistake of trying to use the pede cycle switch to operate the swarmy, or accidentally changing any of the wiring surrounding that area of a pede action if you aren't sure how it works.
Where are the battery's for the swarmfire?
My build: There is not a second power setup for the swarmfire because this one uses the same voltage for both and there is no other reason to divorce the power. The packs are in the stampede battery box.
Recommendation: See above. You want as much voltage as you can get for the swarmy up to about 22v, IMO, because IMO your target should be 500RPM cyclic. That is what makes them the most useful - but I don't think it's worth adding a second power setup for that if you need a lower voltage for the pede, and center-tap harnesses are risky because they drain the batteries unevenly and that for Li-ion/Li-po can be BAD. 14.8v is enough cyclic rate on a swarmy with a decent spring option in it.
What kind of spring is in the swarmfire?
My build: Late gen stock NF (the type with FEWER coils, NOT the old style which will stack solid and DAMAGE THINGS, WARNING!)
Recommendation: See above. SGnerf's springs and the OMW swaps are overkill and you can get all the way to 50 flat with nothing but the NF spring. The heavier loads are NOT matched by a corresponding increase in muzzle energy/velocity - but they are matched by a large decrease in cyclic rate and a large increase in gearbox loads and plunger impact energy.
Speaking of plunger impact energy, do not pad the plunger on the swarmfire. This is one case where SGnerf missed something. The plunger does NOT stop on the PT - it actually stops on the small lug at the rear end of the rod, which hits the end of the track in the receiver, leaving the PT loose and able to move back a short distance before hitting the plunger head. If you add a thick pad, you will only cause the spring to drive the PT/seal assembly forward into the cylinder causing friction from the seal and reliability problems. A pad thin enough not to mess up operation will do nothing to reduce impact loading of any part, because it will never get compressed.
