VMP-1 not cycling

[fingerpuk]

Hello.

I own three of these now, two are perfect one (my sons, he is the destroyer of things) refuses to cycle fully. I have:

- disassembled and lubed with silicone oil everything apart from the nozzle bucking etc (PTFE Grease in the post)
- ensured the mags are filled with gas correctly, I’ve filled vented filled vented filled. I have tried 5 mags, same issue.
- googled and found nothing.
- contacted Vorsk awaiting a reply.


Any immediate thoughts? Would video help explain the issue? The (excuse my ignorance on the terms) “bit that goes backwards as you fire” locks back as if the mag is empty, if I then release that with the catch it’ll fire once again. On full auto I sometimes get two shots before it locks.

When manually cocking over and over it’s super smooth now it’s been lubed up. Nothing rubbing or catching. Wonder if it’s a lack of power from the mags? I’m running Nuprol Green Gas no Silicone.

I’d send it back but want to learn.

Cheers.

 

[fingerpuk]

Update: still happening but I noticed when I pull back the slide myself if I’m not letting it slam back by itself it doesn’t fully close, it leaves a small 2mm gap. I wonder if the nozzles little nudger probe that pushes the BB into the bucking is the issue or the hop up isn’t perfectly aligned.

I’ll try that all later.

 

[Ronin0033]

A vid would help to diagnose, but going from your description about it leaving a bit of a gap:

The MP9 (same internals) can sometimes have an issue that the recoil spring (long spring on top of bolt) weakens and doesn’t fully lock the bolt home.
I’m not sure if this was rectified on the VMP, but a stronger recoil spring solves this.
WiiTech do a 130% one that has always sorted that issue for me.