you can put a spring in a jmj razor blade, i just did one this week. you will have to remove the trigger frame and tray from the gun then remove the tray from the trigger frame. in the top of the trigger towards the back of the trigger there should be a hole for a spring.
to me it sounds like there is a lot of travel in your trigger. i have never had that happen on any of my aka's using a jmj razor trigger and the stock 25 gram switch, and they did not have return springs. but i set up my trigger pull short.
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