sorry, there seems to be 4 parts, the L type catch, spring, fixing lug for other side and what i thought was a pin when i picked it up mid battle but it seems to be a screw now from this pic so my mistake (little google research!)
might pop to a local hardware shop as they may have something in stock
The Mall was a BLAST today! Loved it. Honestly the best airsofting I've done this year.
Highlights included @CarloBear and his 6-7 kill grenade and the mass rave on the concourse in the last game!