Anyone know a grey toy fold-able gun thing?

So a friend of mine was reminiscing on a toy gun she used to have that could like, fold into a bigger gun when you pull the trigger? Said it isn't your typical big-toy gun though, this gun is probably smaller than your hand but not so small that a Lego figure could hold it in its hand

Here's some extra information she listed:

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Brief description of the toy:

Location: found in a blue Tupperware container (the large kind for storage) outside, worn container (definitely aged) in an adjacent container or the same container (it was a long time ago) sat a 90's red m&m toy. (This is what I used to date it roughly)

Age: unknown (speculation is 90's~ maybe early to mid 2000's)

Appearance: gray plastic, no visible metal, chrome, or metallic coating. Size: small enough to fit in 8 or 9 year old me's hand, and when I closed my hand it would've fully concealed the toy. It had a folding mechanism but in base state it looked like a blocky flat (such as a rectangle) gun in machine gun territory, it was too small to shoot anything, instead when you pulled the trigger it folded out to be a bigger gun. The top folding up slightly and then fully forward, maybe it appear shorter but longer. It felt almost cheap like a gumball machine toy and would've definitely fit in one of those bigger capsules. Its mechanism was loose slightly, so when you held it upside down it would half unfold. The sides had a defined design of pipes and a barrel maybe? Its been a while. Im sure there was a design though

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I'm not active on reddit, I just made this account a while ago for fun so I won't be able to instantly get back to any comments or images or whatever but I'll check every now and then, thanks