I’ve spent some time off recently working my way through a backlog of things to unbox, including
quite a few weapons to assemble. I’ve found a product that works well for securing accessories. I’ve avoided using double sided adhesive in the past as most of what I’ve been able to find locally tends to be a bit too thick for use on rails or adheres too strongly, but this product works really well and is an ideal thickness. It’s tacky enough to hold in place but doesn’t adhere so strongly that it takes paint off or is difficult to remove. Just cut a strip and place on the rail or underside of the accessory. Slide the accessory in place then lightly press down and no more sliding accessories.
For curved surfaces like replacing the adhesive on velcro backing for helmets it doesn’t quite have enough grabbing power to keep the velcro material in place. I’m tracking down some 3M specialty adhesives to try out for those since most of Soldier Story’s velcro goes bad over time due to the adhesive.