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Put the factory parts back in and see if the problem goes away. Did it run prior to the parts swap?
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What for? That's ridiculous! Trigger springs or connectors do not - and never have - caused anybody's Glock to stovepipe (or, 'FTE').
It's a new G-36. If your wrist is properly locked when you fire then the most likely cause is that the slide is, ‘short stroking’. This could be caused by the Glock being new and still, ‘stiff’; or it might be the result of using crappy, ‘range quality’ ammo.
Make sure you’re not limp wristing. Use sufficiently powerful ammo; and take a look to make sure your extractor claw isn’t chipped. In my own experience every polymer frame pistol requires a good three to five hundred rounds run through it BEFORE it’s, ‘verified’ for field service. (So, you’ve still got a way to go!)