Upgrading my Airsoft rifle

I spent a pleasant morning at Red Alert, making a couple of small (but hopefully useful) upgrades to my main Airsoft rifle (MTW). I changed the routing of the air line for the HPA engine, routing it out the back of the rifle, under the buffer tube, moving it from down the hand grip. I also replaced the stock grip with a grip containing batteries and switch, so that I can power the HPA engine with that, rather than needing to install a Li-Po battery each time. These were reasonably straightforward upgrades, and I was keen to do them myself - to get the benefit of the learning experience - but I was also very keen to do it around people who know what they are doing. I also wanted to borrow an armourer’s wrench, as I do not have one, and I so rarely need one that buying my own seems a bit pointless. Luck was on my side, as the upgrades went smoothly. I dropped a small spring at one point, and I did not know from whence it came. It turns out that it was a spring which retains the small…

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