Jc27 - I don't have a FS thread in the CH, I tend to get orders via recommendations from folks here and elsewhere (for which I am eternally grateful).
Currently working on another Hasbro'd ESB, here's some pics showing the necessary mods:
Groove dremeled in the barrel to allow LED wires to pass in front of the Speaker (which is a tight fit in the barrel).
Section of breech removed to allow for trigger switch/passage of switch wires.
lever/roller type microswitch in place. Breech block (with section cut out for switch) glued to the frame instead of back of barrel to allow for battery change. Barrel slots on from top and is secured using the pivot screw as normal.
Chrome tube adapter modded to accept LED in centre with four quarter cut outs for sound - speaker is mounted behind this part.
Speaker & LED wiring in place.
Adapter with LED inserted, Front barrel mount glued in place - LED is firing here but ambient light too bright to show it much.
That's more like it - pew pew!
SAS