Description
KJ Works MK1 Gas Pistol
KJ Works MK1 Gas Pistol
The KJ Works MK1 is a non‑blowback gas pistol modelled after the classic Ruger MK‑I, though it’s an unlicensed replica. It features a fixed slide, making it exceptionally gas-efficient and whisper-quiet—perfect as a stealth sidearm or backup gun in outdoor or close-quarters play.
Key Features & Specifications
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Operation: Gas-powered, non-blowback design with double-action only (DAO) trigger. The inner barrel moves as you pull to load and fire each shot .
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FPS / Performance:
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Typical velocity: ~350–400 FPS with 0.20 g BBs (about 0.98–1.1 joules) using green gas.
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Higher readings up to ~450 FPS reported in warm conditions or with propane-based gas
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Construction: Alloy (metal) internal frame under an ABS/polymer outer shell; full-metal barrel; metal hop‑up chamber in newer units
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Hop‑Up: Fixed but adjustable internal hop-up unit (requires small hex key via top‑receiver slot) .
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Magazine: Drop‑out heel magazine in the grip holds both gas and up to 17 BBs; easy to load and refill.
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Sights & Safety: Fixed front and adjustable rear iron sights; onboard sliding safety switch on grip frame.
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Size & Weight:
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Length: ~245–250 mm (~9.5 inches)
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Weight: ~550–565 g (approx. 1.2 lb) empty.
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Performance & Usability
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The gas efficiency is outstanding: one fill can deliver 40–50+ shots before noticeable power drop-off, making it ideal for extended use without frequent refills .
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Accuracy is reasonable for a backup pistol—users report groupings of around 1–2″ at 6 m with good hop‑up setup and heavier BBs like 0.25–0.30 g.
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However, the trigger pull is long and heavy, due to its moving-barrel DAO system. It takes practice to keep sights steady through the full pull cycle .
Pros
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Extremely gas-efficient and quiet operation
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Lightweight and compact, ideal as a secondary or stealth pistol
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Solid reliability and construction for its price
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Fixed hop‑up and adjustable rear sight help tune shot consistency
The KJ Works MK1 is a practical, no-frills sidearm made for gas efficiency and stealthy backup use. Its simple static slide design, light build, and durable internals make it reliable and user-friendly in passive roles. While its trigger feel is unique and less forgiving than blowback pistols, it delivers respectable FPS and accuracy for its class.