Snakes on parade?

[Slater]

Not something you see every day. These are Paraguayan SF troops on parade with a Paraguayan Yellow Boa as their mascot. Looks like they're carrying some flavor of M4:

https://i.imgur.com/JVdFOJrl.jpg

[Rogue556]

Looks like they are using Colt 6940 piston uppers on what I assume are Colt select fire lowers.

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