The UKARA does not apply, as there is already RIF possession. So there is no purchase or manufacture / modify of a RIF
For a technicality - is the private land really private?
Often people want to play on their own or a friends disused part of farm land. A farm may be privately owned but is a business and will have visits from milk/livestock lorries, vets.
Is there any right of way on the land, and / or is there control over any access?
Can you make the game area (or firing range) safe and under control?
Is the land owner aware of their responsibilities of permitting your use?
Is your ‘messing about’ going to be conducted in a safe manner?
Could anyone possibly ever see someone running around with guns?
If the land isn’t as ‘private’ as you think, then could any visitors (business visitor etc) seeing activity going to turn it into an offence of possessing an imitation firearm in a ‘public’ place without good reason?
Then as
@Rogerborg has noted there may or may not be complications with firearms legislation?
Some time ago an airsoft gun would have been a ‘low powered air weapon’ under firearm definitions. A newer clause excludes air soft guns if they meet power restrictions. If your older guns exceed those then it’s a firearm again.
Paintball remains a low power air weapon in legislation, but has other exclusions due to frangible paintballs
Has it been tested as to whether the firearm exemption also counts under the discharging projectiles outside of the boundary? Whether or not it’s still a bad thing for a BB to get out - so is the land big enough to leave a buffer zone?
If you aren’t dicks then the chances are nobody will ever know
