Can you post it to a RFD............yes, but to do so you need to have an account/contract with Royal Mail/Parcelforce. See their Terms & Conditions.
After going this route and having a firearm disappear into the ether that is Parcelforce for 3 days I would strongly advise you don't. Best left to RFD's.
After going this route and having a firearm disappear into the ether that is Parcelforce for 3 days I would strongly advise you don't. Best left to RFD's.
Recently sent a firearm via Parcelfarce, "Next day" "Service"............. utter sh*te, went off grid for three days.
Firearms (and mods as they like to classify them as firearms) can only be received by RFDs, doesn't matter who actually sends it. There is no gain in taking a rifle/mod to an RFD to send it for you, they have no more authority to do so than you do, as long as you're legitimately holding it on a FAC.
As above you have to use a courier who accepts firearms in their terms and conditions.