With respect one ingredient - LUCK the one thing you can not buy or find easily when you need to the v3 box is a weirdy one - the piston rail is a stub see here: now some boxes have full rails but mine had stubby rails - wtf ??? providing only partial support for piston 6mm bushings & stuff & weird nozzle (a shs m4 works correct length but the shoulder is too wide need to stick in say a drill or something & sand down the red paint on the "shoulder" of nozzle) I know people might say theirs was a full rail... but here is a T238 in a Galaxy MP5k - with short rail... Taking nothing away from Luke a legend walk on water etc... (honest - not sarcasm) the gun's quality shines through - the pinion fell off it really is a slapped together dinky gun where quality & precision just glows the moment you open box (now that is sarcasm) ergh nope - the box is not on par with cheap Cyma/JG v3's (though wonder if it was a batch of cheap old JG's or casting coz looks like it takes the v3 cylinder heads with "lugs") As said taking NOTHING away from Luke... it was just fortunate that shimming was OK & meshed lovely with the other motor plus the Perun install went in so smoothly (though with his regular experience of installing them it will go more smoothly) But to drop stuff in and it work nigh on perfectly comes back to the element or sprinkling of luck/fortune at times We have had good easy builds - a few and plenty of nightmare ones where shit just doesn't go quite right (these are the ones you learn from and grateful for the lucky ones) NB: I'm not saying Luke's awesome skills are lucky... but he was fortunate in that it all went so smoothly first time all round (though with his experience he knew what to expect & checked stuff as he went about some replacements & install of Perun etc...) Point I'm making in all of this... Be careful about rushing out to buy one based on this fortunate install coz I think there was a fair bit of good fortune in this that another Galaxy MP5k may not be oozing with based on the cheap slapped together precise engineering of them at times Be interesting to see if Luke purchases one himself & it all goes so swimmingly as the first one but sometimes you get a gun that is nigh on slapped together with fortunate precision or luck FROM THE FACTORY (not saying Luke himself slapped it together - well yeah kinda he did) I just tend to feel this gun was one of the lucky guns in this lottery of China toy guns from 5 year old sweat shops yes a Perun optical will improve it (costing as much as the gun) and maybe the default settings just worked as is the less you mess with stuff the less dramas you might make yourself But reckon this was perhaps a little bit lucky or fortunate out of box plus yeas the plastic covers need to be removed anytime you adjust hop - shit model that one with plastic rails crap with allen keys & battery space is a c*nt - ffs choose battery wisely I'd say hold off running out and buying another toy just yet and concentrate on getting your present ones sorted Well done Luke nonetheless, awesome little build though I think there was a little bit of good fortune (like I have always said - this sprinkling of "luck" comes in handy) is that the TM fairy dust that people often refer to I wonder (that often falls out when people try to upgrade them)