The 7.62 has a 25 &1/4 stainless steel barrel with no bayo lugs. There is what looks like a resin type bedding compound in two places in the forewood and the mag well is also bedded. There are no DCRA markings anywhere.The wood is C broad arrow marked and the handguard appears to be Longbranch as stated by Skennerton when I emailed him the pics. The action is Maltby.
Its a mystery piece but well done. Range reports when ever our range opens up again. The previous owner included some targets with the rifle and it shoots well into the black in a 3 inch circle at 50 yards with 7.62 Ball Ammo.