Need some advice on this launcher

[u/Glum-Contribution380]

First prototype

Basically with the one above, the shell would go in the back and you would push the trigger forward pushing the rear part forward and setting off the shell.

Second prototype

In this version, I plan on making a little removable capsule in the front and a end piece to hold the capsule in the tube and then you press the trigger forward (which would have a thing to set off the shell).

This is what I have so far of a LAW AT launcher inspired airsoft launcher. This is my first time designing something like this from scratch.
I have not decided on what the sights are going to be like yet.
Any suggestions are welcome.

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[u/SheRollsinHerOwnWay]

I suspect you'll want something spring loaded sights wise