RWS/Umarex Synergis TNT Gas Piston .177 – 10-Shot Underlever Air Rifle with Gray All-Weather Stock (2251512 / 723364515125)
The RWS/Umarex Synergis TNT Gas Piston .177 Air Rifle (model 2251512) is a modern, high-capacity underlever designed for shooters who want precision, power, and convenience in one streamlined package. With its 10-round rotary magazine, TNT gas piston powerplant, and durable gray all-weather synthetic stock, the Synergis is built for plinking, small game hunting, and backyard target practice in a wide range of conditions.
If you’re looking for a .177 caliber air rifle that combines smooth underlever cocking, multi-shot capability, and low-maintenance durability, the Synergis TNT is an excellent choice for beginners and experienced airgunners alike.
Key Features – RWS/Umarex Synergis TNT Gas Piston .177
Caliber: .177
Powerplant: TNT Gas Piston (gas ram)
Action: Underlever, single-shot per trigger pull with 10-round rotary magazine
Magazine Capacity: 10 rounds (.177 pellets)
Stock: Gray all-weather synthetic stock
Finish: Matte / low-glare for field and backyard use
Sights/Optics: Typically scope-ready (dovetail or rail, depending on configuration – scope often included in kit versions)
Model Number: 2251512
UPC: 723364515125
TNT Gas Piston Power – Smoother, Quieter, More Consistent
The heart of the Synergis is the TNT gas piston powerplant, which offers several advantages over traditional spring-powered air rifles:
Smoother cocking and firing cycle, with less “twang” or vibration.
Improved consistency shot-to-shot, helping you tighten your groups and stay on target.
Better cold-weather performance than many conventional spring systems.
Reduced mechanical wear and simpler long-term maintenance.
For airgunners who care about both comfort and accuracy, the TNT gas piston system makes the Synergis a pleasure to shoot over long sessions.
10-Round Rotary Magazine – Shoot More, Reload Less
One of the standout features of the Synergis is its 10-round rotary magazine, giving you a big advantage over single-shot air rifles:
Load up to 10 .177 pellets into the magazine, then enjoy rapid follow-up shots with each cock of the underlever.
Perfect for plinking sessions, target shooting, and pest control, where multiple shots may be needed.
Less time spent reloading means more time focusing on accuracy and shooting fundamentals.
If you’re tired of reloading after every shot, the Synergis’ multi-shot design is a huge upgrade in convenience.
Underlever Design – Fixed Barrel Accuracy
Unlike break-barrel air rifles, the Synergis uses an underlever design that keeps the barrel fixed in place:
Fixed barrel helps maintain better alignment and repeatable accuracy, shot after shot.
Underlever cocking is smooth and consistent, making it easier to develop a steady rhythm.
Ideal for shooters who want rifle-like precision and a solid, planted feel from their airgun.
For long-range pellet shooting and precision target work, a fixed-barrel underlever like the Synergis shines.
Gray All-Weather Synthetic Stock – Durable & Lightweight
The gray synthetic stock on the Synergis is built for real-world use, both outdoors and indoors:
All-weather construction resists moisture, temperature swings, and rough handling better than traditional wood.
Lightweight design makes the rifle easier to carry, shoulder, and shoot for longer periods.
Ergonomic grip and fore-end help you maintain a stable hold whether you’re shooting offhand, from a rest, or from a bench.
Neutral gray color gives the rifle a sleek, modern appearance that looks at home on the range or in the field.
This is a stock that’s made to be used—not babied—making it great for youth shooters, new airgunners, and seasoned enthusiasts.
Ideal for Plinking, Small Game, and Target Practice
With its .177 caliber, gas piston power, and 10-shot magazine, the RWS/Umarex Synergis TNT is a versatile platform for:
Backyard plinking and fun shooting (where safe and legal).
Small game hunting and pest control at appropriate distances and with proper shot placement.
Paper targets and steel spinners for accuracy training and recreational shooting.
Introducing new shooters to airguns, thanks to its smooth cocking and easy-to-use magazine system.
Always use appropriate backstops, follow local laws and safety rules, and choose quality pellets matched to your intended use.
Easy to Use, Easy to Maintain
The Synergis is designed to be user-friendly and low-maintenance:
Underlever cocking with a gas piston makes operation simple and repeatable.
Synthetic stock and protective finishes mean you don’t need to worry about delicate wood surfaces.
Routine care is generally limited to keeping the barrel clean, checking fasteners, and storing the rifle properly.
For those who want a reliable air rifle without constant tinkering, the Synergis is an appealing option.
Why Choose the RWS/Umarex Synergis TNT Gas Piston .177?
Multi-shot convenience with a 10-round rotary magazine.
TNT gas piston for smoother, more consistent shooting.
Fixed-barrel underlever design for improved accuracy.
Gray all-weather synthetic stock that handles real-world conditions.
A great blend of value, performance, and modern features for today’s airgun shooter.
Whether you’re building your first airgun collection or adding a multi-shot underlever to an already well-stocked safe, the RWS/Umarex Synergis TNT Gas Piston .177 (2251512) is a capable, modern air rifle that’s ready for fun, training, and serious pellet work.
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