I was aware that the airsoft rules had to spray 50% of your gun unless you were a member of a site. Is it a case of the second I finish putting the marker together I've broken the law?
Comply with 'two tone' requirements and no law broken.
As soon as you build, and someone calls it a RIF then the law has been broken (subject to going to court)
How does anyone with Milsim guns stay on the right side of the VCRA laws?
Depends on classification of MilSim, putting on rails etc and adding shrouds is not necessarily 'MilSim'
But mag fed markers that are lookalikes to real guns without hoppers etc are quite clearly RIFs (They do differ from real guns at least by the barrel thickness, however that needs close up examination which still leaves it as a RIF)
This has not stopped them remaining on sale, e.g. RAP4
However RAP4UK exist from about the time the VCRA came into force, note that they have since been visiting by a Cheif Constables study team from a local area and they recommended that RAP4UK do something about their appearance before someone makes an 'official' visit.
RAP4UKs solution was to offer two tones with blue parts (not necessarily to the approved colours & percentages of VCRA) or a voluntary membership scheme similar to teh airsoft skirmisher scheme (But there is also no exemption in the law with the RAP4UK scheme - It was a matter of them needing to show good intent)
MagFed bodykit mods will make markers into RIFs - which implies the individual has committed the offence. As these are in kit form of only certain parts then the retailer has no obligation on the VCRA.
I own a Tacamo AK47 which though it has a feedneck and air supply I feel anyone could call it a RIF, however I have owned this since before the act came into force and the act caters for those already posessed. So I am legal, but I may need to proove it one day.
I'm not okay to put it in my bag, drive it to the site and take it out there to play with for the day or what?
This should be happening with all markers inluding bling anyway.
On a practical basis whatever could be a RIF is probably fine in this way
I mean the standard Delta Elite unmodded could pass for an MP5 to your general Joe Blogs.
It could do, it is a grey area as it does not need to be an 'expert' to decide if it is a RIF or not.
In the visit that RAP4UK received the senior police officers concerned said they felt most markers they sold could potentialy be RIFs, including basic A5s.
Until someone goes to court its all subject to opinion
You ought to be fine so build a shroud kit onto a marker, just be careful how much you publicise photos if you do it too well, and keep it bagged until you are on site - and be ultra wary of selling on!