I had already tried this before posting, and even with a flame, with no result (I treat flexible materials at work the same way, but it was hopeless with this one).
In the first place I thought I'd switch with Windrix's thrower, but in the end I kinda like the pistol pose, adds a little diversity to the characters. Ergo I have no real need for the accessory pack, too expensive for what it is IMO (like the creature pack), I leave it for those who have a
real squad of USCM they'd want to customize.
Thanks for the tip and comment anyway
.