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Of the new Leopard range, the Standard 600 mm Tube feels the most finished — sleek lines, useful rail options and a rear-biased balance that makes it the one we’d pick for serious field work or longer-range sessions. It keeps the compact bullpup layout FX are known for but stretches the capability with a longer 600 mm Superior STX barrel for improved downrange performance.
The Tube version uses an over-barrel air tube with a 54 cc rear power plenum to deliver steady pressure around the barrel for consistent groups. The chassis and forend are designed for modern accessory use (M-LOK + ARCA friendly), so mounting bipods, tripods, weights or other accessories is straightforward and stable — ideal if you like to tune your setup for specific tasks.
Why choose the Standard 600 mm Tube?
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Balanced, rear-biased handling: gives a natural feel for supported shooting and bench work.
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Longer 600 mm barrel: better ballistic potential and grouping at distance compared with the compact 500 mm version.
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Modern mounting options: M-LOK & ARCA compatibility + Picatinny top rail make it very adaptable in the field.
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Tunable platform: AMP MKII regulator, Quick-Tune hammer wheel and two-stage match trigger let you refine consistency and shot-to-shot performance.
Key features
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600 mm Superior STX smooth-twist barrel for improved long-range potential
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Over-barrel air tube with 54 cc rear power plenum for stable pressure delivery
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AMP MKII externally adjustable regulator for consistent shot energy
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Quick-Tune hammer wheel for easy on-the-fly power changes
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Two-stage adjustable match trigger for a crisp, user-set break
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High-capacity rotary magazine: 22 shots (.177) / 18 shots (.22)
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20 MOA canted Picatinny top rail for extended elevation on long-range optics
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Forend mounting: Picatinny under bottle junction, M-LOK friendly and ARCA-attachment ready
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FX UG1 ergonomic grip & textured rubber buttpad for control and comfort
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Side-lever cocking for quick, positive operation