BigStew

you can it. just means you come down hard on anyone breaking the ban or just bar anyone from using outside BBs (your regs will most likely be buying BBs from you anyway)

A second on the Blaster how ever the tracers are decent just the regular bbs are garbage

Is this just to make sure you have spares for gun failures, as site that can support 30 to 40 rentals will have to be massive. So that's a thing is the site large enough to support enough players to actually make it profitable? I don't think the mall ever had more than 80 players and most CQB sites I have played any more than 40 it's too crowded to play.

are you using new mags/different bbs? have you tried firing it with hop completely off have you cleaned the barrel? Also what make is it.

Thinking about it your best bet would be just to get the A3 cut out a mid section of the gas tube and glue each end to give you a k length barrel (this would however only work with a plastic receiver unless you can weld)

Do you mean put a A3 upper receiver on to a MP5k lower receiver? Because that is just going to give you an MP5 A3. On the MP5K receiver the gas tube is integrated into the upper receiver. It would be less grief to modify the MP5K upper receiver to fit the stock than to modify a MP5 recover to fit a k gas tube.

£230 for a TM MP7 GBBR with body damage, selector issues and a god awful paint job https://prefired.co.uk/ads/custom-tokyo-marui-mp7-gbb/

This appears to be the more exspensive version at £239.00. however that should include a micro dot as well as the suppressor but op has failed to mention the red dot.

The TM ones will unload on one wind but even TM P90 high caps jam like mad. It's a clever method it just doesn't work very well. Unless you are willing to run low caps MAG mid caps are the only way to get reliable feeding.

I have sold guns out side the UK twice never again. both times they went walkies once they were out the UK and the carrier's wouldn't cover RIFs. I really wouldn't bother even if you can get a carrier it could end up being very exspensive for you.

Model, manufacture and what's been done to it is really needed to give any advice. Also who did the work because the first thing done should have been hop and barrel.

Still haven't responded to a stock confirmation request not a good sign.

Legally yes if it's over a certain value. In reality hit and miss whether you will get charged. But budget for those fees you will generally be invoiced by the carrier when your item clears customs.

KWA/KSC makes a Makarov and a Tokarev.

If they are 15ish year old guns they need servicing rather than just upgrading. Frist clean the barrel. Mostly like hop rubber needs replacing. If that doesn't improve performance next step is to open up the gear box. Check the gears are ok, clean it re shim the gears change the seals on the piston head. Regards the body you could fit external braces like on the PSG 1 or find an after market body( rare and exspensive). If you replace them only metal body guns are classic army or an LCT JG are plastic only. There are plenty of YouTube tutorials on taking apart gearboxes

You could replace the front hand grip with one with an integrated flash light (probably more expensive than the gun) swap the foregrip for a ris (somewhere like wish your best bet for cheap), mod your existing for grip. Mount a light on the hand guard and fit the battery in the grip or you could fit a short suppressor/tracer and mount a light to that.

Some might say building a vac form and making a buck isn't exactly easy or cheap. the OP was asking if there was anything cheaper than a Well AEP Uzi

Would add teeth to that list a plastic BBs can do serious damage to your smile.

You can make 95 round mags from king arms 110 mid caps.

Shit they claim to have BARs in stock.

Anyone had dealings with https://www.rtairsoft.co.uk?

Judging by the scale those look like mini Uzis not full size Uzis. Your best bet maybe to go on a prop forum and ask if some one has made a replica or 3d printable file. This might be a better base gun https://bbguns4less.co.uk/products/blackviper-micro-uzi-electric-bb-gun-in-clear.html it just won't shoot very good. I just don't see this being a cheap build but good luck.

You are not getting any cheaper than that to buy the parts needed sperately would probably be 4 times the cost of buying the gun.

There is not such thing as cheap when building from scratch. From what you are asking it appears you have no knowledge of Airsoft do your self a favour and just use off the shelf guns.

This is your cheapest quickest option if I am understanding you right. https://www.bbgunsuk.co.uk/products/Well-D91-Electric-UZI-Airsoft-BB-Gun-in-blue.html these will fire single or full auto and you are not going to have to do any fabrication other than paint them.