There's no love lost between Brianna "Chickenfry" LaPaglia and Montana Boy Mark Estes ... at least not on "Special Forces: World’s Toughest Test"!

In an exclusive preview clip obtained by TMZ, the Barstool Sports star goes full beast mode on the TikTok hunk during one of the show's most brutal challenges, "Murderball." The wild footage shows Brianna sprinting across the mud before delivering a sharp kick straight to Mark's stomach, sending both of them crashing into the dirt as they wrestle for control of the ball like total warriors.

In addition to the muddy mayhem, the remaining recruits also take on the nerve-racking "Postman’s Walk" ... a 165-foot rope bridge suspended 200 feet above a canyon floor, which they have just 10 minutes to cross.

It's all part of the military-style co

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