Derya Arms Unveils the TM22 Pump Box-Fed .22 LR Rifle

The rimfire market has predominantly favored self-loading semi-automatic platforms or traditional bolt-action rifles. However, semi-automatic .22 LR rifles frequently face cycling reliability issues when shooting low-velocity sub-sonic loads or heavy suppressor setup configurations due to varying blowback impulse dynamics. Conversely, traditional pump-action rimfires often rely on tubular magazines that are slow to reload and incompatible with modern tactical stock adjustments. Addressing this gap, Derya Arms (operating out of Jacksonville, FL and Konya, Türkiye) has officially introduced the TM22 Pump. Built around the established TM22 receiver layout, the TM22 Pump merges manual pump-action cycling with detachable box-magazine capacity and multi-state compliance.

The Derya Arms TM22 Pump features a threaded 1/2×28 target barrel, 10-round detachable box magazine feed, an adjustable stock cheek weld system, and 50-state compliant pump-action mechanics.

Architectural & Technical Breakdown

• Platform Mechanics & Action:
  • Manual pump-action cycling engine utilizing dual action bars for smooth, non-binding shell feed and extraction.
• Barrel Configurations & Metallurgy:
  • Precision rifled target barrel featuring a 1:16″ Right-Hand (RH) twist rate optimized for standard 36-40gr .22 LR projectiles.
  • Offered in 18-inch (TM22.PUMP.18) and 20-inch (TM22.PUMP.20) barrel lengths.
  • Muzzle factory threaded in 1:2×28 TPI with included thread protector for suppressor or muzzle brake integration.
• Feed System & Magazine Integration:
  • Ships with two standard 10-round aluminum box magazines; fully backward-compatible with TM22 family 15-round and 25-round magazines.
• Receiver & Optics Infrastructure:
  • Lightweight aluminum alloy receiver housing a full-length MIL-STD-1913 top Picatinny rail paired with a traditional front bead sight.
• Stock System & Ergonomics:
  • Synthetic stock equipped with a height-adjustable cheek piece and stackable buttpad inserts to customize length of pull (LOP).
• Mass & Mass Metrics:
  • Unloaded total weight of 4.85 lbs (2.2 kg).
• Legal & Regulatory Status:
  • Fully compliant across restricted states, including California, Maryland, and Massachusetts.
• Commercial Metrics:
  • USA MSRP set at $429.00 USD.

Performance Analysis & Practical Utility

From an engineering perspective, changing the TM22 operating system from blowback to manual pump-action eliminates reliance on recoil impulse to cycle the action. In suppressed shooting applications, semi-automatic rimfire rifles frequently vent unburned powder, carbon soot, and gas back into the receiver and face of the shooter. The TM22 Pump’s mechanical lockup contains backpressure within the chamber, resulting in a quieter shooting platform when paired with a .22 LR suppressor on the 1/2×28 threaded barrel.

Furthermore, manual cycling allows shooters to reliably run any ammunition grade—from ultra-quiet 710 fps sub-sonic loads to 1,400+ fps hyper-velocity round-nose ammo—without experiencing failure-to-feed or failure-to-extract malfunctions. The inclusion of an adjustable cheek pad and modular LOP spacers ensures proper eye alignment whether utilizing low-profile iron sights or elevated optical sights on the top Picatinny rail.

Systemic Advantages & Limitations

• Advantages: Independent of ammo velocity (cycles sub-sonics and match ammo flawlessly); 50-state compliant (CA, MD, MA legal); utilizes widely available TM22 10-, 15-, and 25-round box magazines; lightweight 4.85 lb chassis; factory 1/2×28 suppressor threads.
• Limitations: Manual stroke requires user intervention between shots, reducing cyclic rate of fire compared to semi-automatic variants; pump forearm motion can introduce minor optical movement during fast follow-up shots.

Definitive Analytical Assessment

The Derya Arms TM22 Pump is a pragmatic, highly versatile evolution of the TM22 rimfire platform. By pairing reliable box-magazine feeding with an ammo-agnostic pump-action mechanical engine, Derya Arms delivers an accessible, suppressor-ready rifle engineered for training, small-game hunting, and restrictive regulatory markets.

Technical Specification Matrix