sniperslucky Posted July 10, 2016 Share Posted July 10, 2016 Hi All, As above, when the battery is disconnected on my M4 the trigger works fine in semi, full auto and safety, when the battery is connected the trigger does not return on semi and i need to push the trigger forward to take another shot but when on full auto the trigger returns to the normal position ???????????. I have stripped the gearbox down and rebuilt it and the trigger operates the same as before. Any ideas Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted July 10, 2016 Supporters Share Posted July 10, 2016 The actual trigger's spring is broken/missing - that is what it sounds like think many of us have tried to close a box without them bastid trigger or AR latch springs.... yup you do need them in there Reason why auto works - the switch trolley spring up top is pushing back the trolley & trigger together On Semi - the trolley is lifted of the trigger/sear and flies backwards... if the trigger's spring is not working/broke/missing then the trigger just sits there and you have to push trigger backwards to re-latch onto trolley again Well that is the general principal of it all Have had a gun fire full auto on semi and remain firing full auto due to pinching contacts too tightly (not wise to have them too tight) But sounds like your issue is down to trigger spring problem I reckon unless I've misread your description Link to comment Share on other sites More sharing options...
sniperslucky Posted July 11, 2016 Author Share Posted July 11, 2016 Thanks Sitting Duck , i'll take it apart again and have a closer look. Link to comment Share on other sites More sharing options...
sniperslucky Posted July 11, 2016 Author Share Posted July 11, 2016 You where spot on Sitting Duck, spring was there just snapped Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted July 11, 2016 Supporters Share Posted July 11, 2016 Getting in touch with pete / ak2m4 on here or FaceBook to confirm the ZCI spring set includes the trigger spring: http://www.ak2m4.co.uk/internal-parts/misc-internal-parts/zci-gearbox-spring-set-v2 Yeah I know it says it is in there but just double check won't hurt as often even SHS spring sets don't include the trigger spring So worth an extra quid - £4 over a £3 set with no trigger spring as you need a new one Link to comment Share on other sites More sharing options...
sniperslucky Posted July 12, 2016 Author Share Posted July 12, 2016 Thanks Sitting Duck, that was my next Q? as i could only find sets including triggers. Looks like the spring top left on link is the one i need. Link to comment Share on other sites More sharing options...
sniperslucky Posted July 13, 2016 Author Share Posted July 13, 2016 Getting in touch with pete / ak2m4 on here or FaceBook to confirm the ZCI spring set includes the trigger spring: http://www.ak2m4.co.uk/internal-parts/misc-internal-parts/zci-gearbox-spring-set-v2 Yeah I know it says it is in there but just double check won't hurt as often even SHS spring sets don't include the trigger spring So worth an extra quid - £4 over a £3 set with no trigger spring as you need a new one All good sitting Duck comes with spring spoke to Pete who confirmed order place awaiting goods . Link to comment Share on other sites More sharing options...
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