It's pretty clear in the arms code that an e-cat is for MSSA (military style semi automatic). So if it's not semi automatic...then it's not an MSSA. Can't be any clearer that that.
But like removing a bayonet lug, your conversion would have to be permanent, and done in a way where you couldn't simply pop a gas tube on and you're back to semi again.
I'd just do it, you know you're in the right.
Kj
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