I knew someone - in a roundabout way - who built one from a deactivated No1 rifle. Yep, STILL deactivated but now a deactivated deLisle! That's when the sxxx hit the fan.............. According to an over zealous cop decided that he had fundamentally altered what it originally was and NOW possessed a real deLisle - albeit 'deactivated' and still totally unable to load, fire or discharge a real round. To cut a long story short it came to the MoD (who had some originals for comparison and expert witnesses on hand) for an opinion at his suggestion plus that of a Barrister who was narrowly involved in the increasingly absolutely farcical situation before it cost even more and more from the public purse and his private finances. Common sense and '....the bleedin obvious won the day.