Something like this
http://www.ebay.co.uk/itm/12V-5A-Adaptor-AC-Power-Balancer-Charger-MYSTEKY-iMAX-B6-B5-LCD-Monitors-FT-/221810878332?hash=item33a4f5677c:g:ddkAAOSwDNdVjT7X
But with power cable
What foldable stock you have on the mp5k? Because if it's the PDW then you can remove the stock from the endcap, move the sling loop to an other hole and you get that what's on your link.
This:
GFC is GunFire Custom, meaning it's kjw in your case but they tinker with it. They relube, probably reshim AEG gearboxes, maybe change the spring and test it. I don't know what they do with gas guns, probably just relubing, testing.
I don't get it how it works. The nut seems to be glued in and the bottom part doesn't have a nut. So it seems somehow there is a threaded rod that can move up and down but can't turn.
Not worth £1. Useless as a sniper rifle out of the box, breaks quickly and there are no parts for it to upgrade or replace the broken ones. Not compatible with anything.
The position of the front sling mount is unique to this, if you see that, it's this model. It's an AGM originally.
Not to mention that you can get a brand new Bar-10 for that price and that's a great choice. When it is in stock in Poland that is.
The current JG versions have that vertical BB tube on the hopup itself. All the other versions have it on the magwell. If the magwell and the hopup has it, just cut it off from the magwell.
Make sure the G36 mag fits in the pouch you choose. A single G36 mag will fit a double M4 pouch if there is no separator in it. Also the g36 mags has those things that clip them together and they catch on anything horizontal in the pouch. Elastic pouches won't work either. You can get an M4 magwell for the g36 though, that solves this problem.
Excellent choices.
Get at 0.25 or heavier BBs. Don't go for the plate carrier, it's very cumbersome. Get a chestrig or a molle belt or both. Helmet should be the last on your shopping list.
Get good boots, with good socks and maybe a gel insole for it.
Edit: Proffrink ninja'd me.