Legal rifle most similar to C7/AR15?

[u/EI_CEO_CFT]

I know legal is in the title and I'm begging you guys not to let this devolve into a conversation about legislation; I just want something I can take up north to fuck around with in peace. Onto the post.

I'm in the CAF and my unit doesn't get as much time as I'd like with the rifles. Before that gets sensationalized, I'm not in a trade where thats as relevant anyway - however when we go on tactical exercises I don't like having to take a minute to remember my stoppage drills, field stripping, etc. I'm looking for any rifle, any calibre, that functions the same way as the C7. I know I could get an airsoft clone but I'd prefer to have something that fires. Of course, anything closer to 5.56/.223 Remy ammo would be nice, but Im looking for the cheapest thing that works and fires real ammunition and is legal. Any recommendations are appreciated!

[u/Iokua_CDN]

With the Straight pull MRA  Renegade, it won't be like shooting the C7, but I wonder if it would be better for emulating your  stoppage drills etc.  You don't need semi auto for that.

As for as shooting, perhaps a 22lr semi auto, or a 223 Turkish gun like the Alcor is going to be very different doe takedown, however would  be closest for shooting practice.

Or option 3, more accurate airsoft for practicing drills, and then the second option for shooting practice