Apologies folks,
For both necroposting AND also for not coming back with feedback regarding my initial forum post which could have been helpful to others. I hope I can close out this out with my feedback and it helps others going forward.
My issue was relating to importing PARTS and not an actual RIF/IF.
For importing RIF/IF's I still highly reccomend engaging with(and supporting) your local (or at least UK based) retailer(s) to handle this part. In my own experience, most will be happy to support and can source directly from manufacturers/distrubutors.
In my case the part was no longer manufacutred and I could only source from an international retailer.
The retailer wrongly assigned a HARM code to the item (protecting themselves and exposing the buyer).
The form sent by the shipping company was geared towards importing a RIF which I was not importing therefore I just filled out it as best as I could and I received the goods okay albeit with a hefty delay and import tax.
Nowhere on the form does it state it is confidential or private therefore I have attached the document with my personal info redacted in the hope it is helpful for others in a similar boat.
In the e-mail back to the shipping company I stated the following:
The shipment can be inspected. The shipment does not contain a RIF or an IF, it does not have a velocity because it is not a RIF or IF. It also does not resemble a RIF or an IF, it is an airsoft accessory.
If you have a UKARA number just use it.
Ultimately, this was my defence, the part could not be used to convert or manufacture a RIF therefore no defence needed. But I'm in agreement with you that prospective imports should consider what they're importing and how it could be construed by BF.
RIF declaration_REDACTED.doc