Bizarre vfc issue

[NH Shooter]

I have a vfc recon m4...And it's developed a funny habit... Not really a habit, but last skirmish it would refuse to fire in semi a couple of times. I used it on semi pretty much all day for around 4k rounds but about 4 times you would pull the trigger (full travel) and nothing would happen.

You fixed it by either "safe-semi" or "full-semi"... So move the selector and is back to working again. The problem never happened in quick succession... If it happened in one game, it wouldn't occur for another hour or so... So no pattern.

I was going to bust open the gearbox anyway to have a poke... But before I do... Any ideas?

 

[Lozart]

Try tightening the little screw in the back of the fire selector, it might be as simple as it slipping out of place. Used to happen on my TM M4 too.

 

[NH Shooter]

I shall give it a go... Thanks for the info

 

[Rock-climby-Dave]

It's a fairly common fault on V2 gearboxes.

Just check the top of your trigger and back of the switch for wear