The Pro Arms 140% hammer spring is a direct upgrade path for TM PM7 users seeking consistent performance gains without platform swaps. This reinforced spring increases hammer strike force, translating to higher FPS and snappier blowback cycling—ideal for UK woodland and CQB sites where marginal advantages matter.
Key Features
- 140% spring rate – boosts FPS to approximately 300fps on 0.20g BBs
- Gas blowback optimisation – sharper slide action and quicker reset
- Drop-in compatibility – fits TM PM7 platform without gunsmithing
- Durable construction – Pro Arms quality steel and precision tolerances
- Cost-effective upgrade – extends pistol lifespan versus wear-out replacement
Real-World Use Cases
This spring suits semi-automatic CQB warriors, Milsim pistol-primary players, and pistol-focused duellists. The FPS bump helps overcome minor hop inconsistencies at mid-range, while improved blowback snappiness rewards trigger discipline on target transitions. Not a replacement for full platform upgrades, but a smart tuning step for committed TM PM7 operators.
Technical Specifications
- Brand: Pro Arms
- Model: 140% Hammer Spring
- Compatibility: TM PM7 GBB
- Expected FPS: Approximately 300fps ± 10% (0.20g BBs)
- Power Source: Green Gas
- Material: Precision steel
- Installation: DIY-friendly, no special tools required
Compatibility & Upgrades
This spring integrates seamlessly with stock TM PM7 internals. Pair it with a heavier hop rubber or brass nub to stabilise the increased velocity. Pro Arms also manufacture compatible nozzles, pistons, and trigger housings if you plan phased upgrades. Verify your gas source: Green Gas performs best in UK winter; consider HFC or Propane for consistent sub-zero output.
UK Legal & Site Notes
The 140% spring keeps you well under the 1.3J legal ceiling for semi-auto pistols at most UK sites. However, verify your local skirmish zone’s chrono limits and FPS brackets—some restrict upgrades to maintain level play. Always chronograph after installation; gas pressure, temperature, and hop setup all influence final velocity.
Order your Pro Arms 140% hammer spring today and reclaim the edge in your TM PM7. Fast UK shipping, expert support, and in-stock guarantee.
| pa_platform-type | Pistol |
|---|---|
| pa_ukara-required | Yes,No, |
| pa_included-items | Magazine |
| pa_skill-level | Regular Player |
| pa_warnings | Lubrication is required |
| pa_fps | Approx.300fps ± 10%, using 0.20g BBs |
| pa_weight | Approx.0.55KG |
| pa_length | 20.5cm |
| Brand | Pro Arms |
| pa_colour | Black,Grey,Dual Tone, |
| pa_construction | Alloy outer barrel, slide and controls. Steel pins and screws. Aluminium magazine well extension. Polymer frame and backstrap. |
| pa_powered-by | Green Gas |
| pa_blowback-type | Gas Blowback |
| Platform | CANiK SFx RIVAL |
| pa_fire-modes | Semi Automatic |
| pa_shooter-configuration | Right Handed |
| pa_hop-up-type | On outer barrel, accessible when the slide is removed. |
| pa_hop-up-adjuster | Gear |
| pa_rail-system | 20mm Pistol Rail |
| pa_sight-type | Light enhancing front iron sight with anti-glare rear sight |
| pa_barrel-length | 4.5'' |
| pa_barrel-diameter | 6.08mm |
| pa_magazine-type | Gas,Low Capacity, |
| pa_magazine-capacity | Approx.22Rounds |
| pa_outer-barrel-thread | Female |
Related products
