Hopup arm keeps moving

[mirinjawbro]

hello al

have a G&G MP5SD5 EBB.

recently when firing either leaving bolt open or closed the sliding hopup arm keeps moving towards no hopup and needs adjusting almost every mag

any ideas?

thanks

 

[strykerles]

If its the same hopup as an mp5k I put an oring under the screw guiding the hop arm

 

[Rogerborg]

Urgh, MP5 hops.

If its the same hopup as an mp5k I put an oring under the screw guiding the hop arm

Or tighten the screws, or put oring(s) between the hop slider and the barrel, or cable tie the slider to the barrel, or...

Do you have one of these?

I assume there's a screw on the other side holding the slider in place that you could tighten up.  Or add washers and/or tape as the mood takes you in order to increase friction.

 

[mirinjawbro]

thanks all will have a go.