We were asked to find out if Irish Republican players could visit sites north of the boarded and play and buy RiFs, or would they need to register at an Northern Ireland site in the method of 3 games in not less than 2 months and the reply I have below is from the NI Firearms office (NI HO).
We are further checking to see if the same ruling below will apply to all other EU counties as regards to entry to the UK
"I think that the airsoft defence could be met by the player/importer producing evidence of a booking at the properly insured site but he would do well with to check with the HMRC or police that he might be likely to encounter at the point of import that this would do the trick for them."