Plenty of experience with water slide decals over the years, especially with this Aircraft hobby these days!
As @Friendly_Fire mentioned, thin printed waterslide decals are adjustable when first applied and wet, then can carefully press/blot down the surface using paper towels to remove excess water to get them to hold/set, just don’t “wipe” them as they get can move or tear.
Thicker Vinyl type stickers can be applied with water and detergent and squeegeed out to set, as they are a lot more durable and have a higher grade adhesive backing than waterslide decals.
Yeah, but the decals Beemer’s talking about for his specific project are waterslides.
I would think a few coats of clear over the rub to apply ones would be advisable? It sounds like they apply much like the old Lettraset letters and therefore prone to rubbing off in time?
I havent pulled them apart yet.
Outer surface looks to be quite durable…long term adhesion might be an issue…
Particularly with gripping / cocking.
( No jokes needed there… i can see them coming already lining up)
With prints being so cheap, its easy to get spares to muck around with, and improve upon. I can have ago of sanding / filling / painting these bits, and repaint the slides.
I know how to fix the blurry borders, and sharpen them up now.
Its got the moving hammer / trigger.
And, the front barrel is infilled 100% solid, to give it some heft and weight.
That was missing from the previous incarnations…
Just stickers? 
