Help identify source of weapon sprues - metal, 15 mm, please

[FifteensAway]

Can't for the life of me recall where these were sourced - had for a LOT of years and just now getting round to working on this.  They are marked with NNC3 on the bulk of the sprue.

Thanks to anyone who can identify source.  I expect people may ask where I got them once I get them painted up as intended and I'd like to be able to provide that information.