Spring Power - Break Barell

Spring-piston Air Rifle
 
Spring-piston air rifle are able to achieve muzzle velocities near the speed of sound from a single stroke of a cocking lever or the barrel itself. The difficulty of the cocking stroke is usually related to the power of the rifle, with higher muzzle velocities requiring greater effort.

Spring-piston rifle operate by means of a coiled steel spring-loaded piston contained within a compression chamber, and separate from the barrel. Cocking the rifle causes the piston assembly to compress the spring until a small hook on the rear of the piston engages the sear; pulling the trigger releases the sear and allows the spring to decompress, pushing the piston forward, thereby compressing the air in the chamber directly behind the pellet. Once the air pressure has risen enough to overcome any static friction and/or barrel restriction holding the pellet, the pellet moves forward, propelled by an expanding column of air.

Spring-piston guns have a practical upper limit of 1200 ft/s (370 m/s) for .177 cal (4.5 mm) pellets. Higher velocities cause unstable pellet flight and loss of accuracy. Drag increases rapidly as pellets are pushed past the speed of sound, so it is generally better to increase pellet weight to keep velocities subsonic in high-powered rifle. Many shooters have found that velocities in the 800 - 900ft/s (270/s) range offer an ideal balance between power and pellet stability.
Spring rifle are typically cocked by a mechanism requiring the rifle to be hinged at the mid-point (called a break barrel), with the barrel serving as a cocking lever. Other systems that are used include side levers, under-barrel levers.



De Pyra Astrea

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De Pyra Astrea

Specification :

  • Action : Break Barrel
  • Power Plant :  Spring Piston
  • Caliber  4,5 mm / 0.177”
  • Velocity : up to 675 fps
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De Pyra Mercury

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De pyra Mercury

Specification :

  • Action : Break Barrel
  • Power Plant : Spring Piston
  • Caliber : 4, 5 mm / 0.177”
  • Capacity : Single shot
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De Pyra Meteor

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De pyra Meteor

Specification :

  • Action : Break barrel
  • Power Plant :  Spring piston
  • Caliber : 4,5 mm / 0.177”
  • Capacity : Single shot

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De Pyra Jupiter 27

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De Pyra Jupiter

Specification :

  • Action : Break barrel
  • Power Plant : Spring piston
  • Caliber : 4, 5 mm / 0.177”
  • Capacity : Single shot
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