Umarex (VFC) HK416D GBBR Hop

[Sketchyetchy]

Hi all, I have the said rifle from the title. In fact this exact one from the video below. However the hop adjustment is a small Allan adjustable grub screw that you have to take the whole rifle apart to adjust. Great. Put it all back and fire some rounds. Loosens off. Has anyone got one of these or has had the pleasure working on these can suggest any help? I'm at the point of using medium loctite and sealing the screw in.  Struggling to find any type of replacement hop system for this model of 416. Can't find threads on this, only other issues and the usual VFC is wank threads 😂

 

Just for reference on how the hop system works and a link to an old listing from patrol base to help https://www.patrolbase.co.uk/umarex-h-and-k-hk416-d-gbb-airsoft-rifle

 

In order to adjust the HOP in the Umarex HK416 D, you will need to field strip the rifle, and remove its bolt carrier and charging handle. To do this, first, remove the magazine then rack the charging handle. Next, simply push the rear receiver pin through from the left side to the right, where it will remain captive in the receiver. Following this, the receiver will hinge apart around the front pin. The bolt carrier can then be removed, followed by the charging handle, which will need to be pulled rearwards then down, coming out through the same area through which the bolt carrier was removed. This will leave you with an empty upper, at the front of which you will note the silver chamber, at the bottom of which is the HOP adjustment grub screw. Using the provided Allen key, you can then adjust your HOP. To reassemble, place the charging handle back in first, with slightly less than half of the handle exposed through the rear of the receiver after that the bolt carrier goes in. Next, push the two parts fully back in as a unit, closing the receiver and pushing the locking pin back through once you have done so.