Doubt it's a spring, the KJ M9 are very reliable on that unlike others.
You most likely put too much paint between trigger rod and body, result : you either need gravity or use your finger to make it depress the sear.
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Tous les jours nous nous endormons plus instruits mais pas forcément moins bêtes...
I can do a CTRL+ATL+DEL on your gun !
Gun doc in Montreal on AEG, GBB, GBBR and Bolt rifle (gaz and spring)
Heavy custom builder (including painting)
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