Strange brass

[Daver7]

I came across these as I was scrounging brass on a LEO range.
The long one is 223 when collapsed, the other is 9mm (I collapsed it and can't get it to slide back open.
Wondering what I found?

[ascast]

Auxilary cartridges, sub-caliber adapters I think. To shoot 22 LR in a 223. Or shoot 9mm in 38 Special, just guessing

[Moleman-]

They're Simunition cases.

[BK7saum]

They're Simunition cases.

Bingo, simunition. 223/556 and 9mm

[FishHunter357]

As others have stated, they're simulation rounds. They usually shoot out "paintballs" not really spherical though.

[DCM]

simunition/chalk marker training stuff.