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So I figured I'd start a thread on this seeing as at least 8 other people in the UK must have them (based on The Grange's sales). Overview In case you've not been following, the Wolverine SMP (Single Moving Part) is a high pressure air based system designed to drop in to existing gearboxes. The nearest similar product is the Polarstar, but that requires you to buy a complete gearbox shell, which will either be for a V2, V3 or (I think) M249. One of the main selling points of the Wolverine is that you can drop it into any gearbox that takes a standard sized cylinder and you're good to go - assuming they make the appropriate length nozzle for it (currently there are 12 different ones). There's an install video here (not mine) that gives you an idea of the actual install process. Essentially it's "remove all the gears, etc, leave the trigger in, install trigger board and SMP unit". http://www.youtube.com/watch?v=j9P3EVpNrw8 The install process isn't entirely straightforward as I had to do a little selector plate shaving in order to get both fire modes and still have the physical safety work but other than that it's easy to install and very easy to change RoF and dwell (to manage air efficiency for the most part). ROF can be varied between chugging away slowly or absolutely insane (like, 60rps territory). FPS is set by dialling in the PSI between 40 and 120 on your air rig's regulator and by the length of the barrel you're running. Long barrels at a high PSI will easily hit UK sniper limits. Happily you can also set the fire mode to DMR which is semi with approx 2 second pause between shots. Alternatively you can set either full auto or burst between about 2 and 10 rounds. Issues Because with me it's never plain sailing... The issue I'm having, and have seen others report are something along the lines of "The main problem is that while most of the BBs fly alright but every once in a while there's a significant drop in trajectory, as well as some BBs just go left/right for some reason." Sadly I had to resubscribe to Facebook (argh, spit, etc) so I could join the SMP owners group. There is info in there, but there's also a lot of people saying "It's your hop/alignment, this system is awesome". So I'm inclined to think that for some people this is just a drop in, it all lines up and works perfectly, and for others... well, not so much. For my part I have tried 4 different hop ups (including lonex and prowin), hop rubbers and barrels as well as 2 different gearbox shells (TM and lonex) and I'm still seeing the same sort of inaccuracies and random shots. I've even dropped it into a different gun entirely, which seemed marginally improved but not perfect. The happy SMP owners say that it can't be a problem with the SMP because all it does is push out air and that's it. But there seem to be an equal number saying "but this setup worked fine in my old AEG/Polarstar and the only thing that's changed is the engine". Perhaps like many things the truth is somewhere in the middle, but it's hard to make an argument that this a simple drop in replacement when faced with issues like this. Which is a shame, as clearly there are people having great fun with them, some are shooting straight as lasers and they are both easily adjustable and quiet as a mouse's fart when suppressed. Sadly I'm not one of them. So I shall try to work out what to troubleshoot next. Ideally without having to buy a whole new shell/donor AEG... Any other Wolverine users out there? What are your experiences?