COMPS competition spring

9,80 

Tubular magazine spring for competition shotgun.

Available in light, medium or factory strength. Minimum order quantity 3pcs.

 

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Description

Magazine spring family engineered for competition shotguns. Available in factory, medium and light version. Economical shipping rates worldwide.

Less loading resistance means increased loading speed and success rate. Correct magazine spring rating is important for the functionality of your shotgun.

Measured data has been collected on almost all manufacturers, there can be even a 30% difference in output of the products you can find available. A big difference can also be found between production batches/years as manufacturers can change the specifications. COMPS is made to change all of that and to give fixed standards. A shotgun magazine spring family, made to exact specifications, every production batch tested and measured for output spring force. COMPS is also available with different ratings and data is collected and published to help you tune your competition shotgun.

Specifications:

  • Length for light 1200mm, medium 1200mm and factory 1250mm
  • Light for most modern semi-auto competition shotguns with up to 12 shell tube
  • Medium for most pump-action shotguns with up to 12 shell tube, or increased feed reliability for semi-automatics
  • Factory rating for pump action shotguns without feed modifications, very long tubes and increased reliability for all platforms when dirty or other problems with feeding
  • High quality steel spring wire with color marker (spring steel not colored, as in the picture)

Instructions:

  • Remove any color/power markers or packaging material from the spring
  • Assemble spring to the magazine tube and fully compress it 4-5 times (fill the magazine full of shells)
  • Spring will take some set and shorten approx 40-90mm
  • Cut the spring to preferred length, after the spring has taken a set
      • You can always leave the spring longer than recommended minimum, this will add reliability
      • Recommended minimum for Light in 12 shell tube: tube length + 350mm (no need to cut)
      • Recommended minimum for Light in 10 shell tube: tube length + 300mm
      • Recommended minimum for Medium in 12 shell tube: tube length + 250mm
      • Recommended minimum for Medium in 10 shell tube: tube length + 200mm
      • Recommended minimum for Factory in 14 shell tube: tube length + 250mm
      • Recommended minimum for Factory in 12 shell tube: tube length + 200mm
  • Make sure your magazine tube and follower is clean and smooth
  • Always test the functionality of your setup in training
  • Ready to rock&roll

 

Comparison chart

Available shipping rates:

Finland Priority Europe + RU (no tracking) Express World (tracking)
3-4 springs 3,20€ 5,20€ 21,10€
5-8 springs 6,40€ 8,70€ 38,20€

Minimum order quantity 3pcs and maximum 8 springs will fit in to one package/order. Priority Europe estimated delivery times 2-6 working days, Express World 2-8 working days.

 

Advanced instructions:

Cutting the spring shorter than recommended will increase the magazine capacity by approx 1mm per cut coil. If this is not absolutely needed, do not do it. Total spring force and work required to fill the magazine tube will anyway remain very similar, as springs will become stiffer when coils are cut. Cutting the spring will only reduce the spring force on the first shells so magazine capacity is the only reason to go below minimum recommendation. Depending on the shotgun, additional 4-8mm of magazine capacity could be achieved by cutting the spring below recommendation, while the shotgun still remains operational.

Timing of the shotgun shell feed is a combination of gun, ammunition and also the shooter physique (recoil control). Always test your setup in training!

Q&A can be found below

 

 

Collected data

Last updated 9.9.2019

 

Model Feed timing modifications Mag tube Spring Comments
Benelli M2 12 and 10 COMPS-LIGHT + 350 and 300mm OK
Beretta 1301 12 and 10 COMPS-LIGHT + 350 and 300mm OK
Beretta 1301 10 COMPS-LIGHT + 100mm Does not always feed the last shell, insufficient spring length
Benelli SuperNova King Competition RSB2 10 COMPS-MEDIUM + 200mm OK (Pinoy telescope inner tube is 10 shells)
Benelli
Supernova
King Competition RSB2 10 COMPS-LIGHT Occasional feed speed problems with full tube and loose/relaxed shooting stance
Benelli Supernova Innovatac RSB3 (reduced overlap) 10 COMPS-LIGHT + 300mm Works with 28g birdshot, but is on limit. MEDIUM spring is recommended.
Benelli Supernova Innovatac RSB3 (reduced overlap) 12 COMPS-MEDIUM + 220mm OK
Remington Versamax 12 COMPS-LIGHT + 350 OK
Remington 870 DIY welded 10 COMPS-LIGHT+ 300mm Works with 28g birdshot, but is on limit. MEDIUM spring is recommended.

 

 

 

 

Q: “will the spring work in shorter magazine tube?”
A: “yes, and you can cut extra -50mm off the spring if using a 8 shell tube vs. 10. Shorter tube is always easier to tune to be reliable”

Q: “should I put the closed or cut end inside the follower?”
A: “The spring will compress more nicely inside the tube if you put the cut end inside the follower, but it will work either way”

Q: “how much I can cut the spring?”
A: “depends how much resistance you shotgun feed system (shell latch, tube, follower) has for the last shells. Stay with the recommendations if possible.”

Q: “what is my current spring rating XYZ”
A: “Can be anything, likely it is 70-100% in the spring scale, there is a big variance between spring manufacturers and production batches”

Q: “I am running 32g loads or heavier”
A: “spring designs are sufficient for the additional mass of 32g, however they are optimized for typical 28g competition loads. Always test your setup before a match. Increase the spring rating if you are shooting very heavy loads.”

Q: “why does longer magazine tube require a spring with stronger rating”
A: “because additional shells and the additional inertial mass will slow down the feeding”

Q: “I have a sticky magazine tube”
A: “check that it is clean, follower is suitable and the inner connection between the tube and tube extension is smooth”

Q: “do I need to upgrade the feed timing on pump-action shotgun?”
A: “no, If you do not pump too fast”

Q: “why does pump action require stronger spring?”
A: “because of the two shell latch design that will cut of the feeding at the during the action travel. Unlike modern semi-auto shell one latch design that will remain open the whole action cycle”

Q: “does longer spring mean stronger spring with shotgun mag tube springs?”
A: “no, length of the spring only relates to pre-compression that is needed to feed the last shells. Actual spring strength is a combination of wire, diameter, pitch, material etc.”

Q: “what spring to use with telescopic magazine tube?”
A: “the inner tube spring is recommended to be lighter when compressed than the telescoping spring, for the telescope to work in the right sequence. Light or medium.”

Q: “can I make the spring lighter just by cutting it”
A: “no, you can only reduce the pre-compression by cutting a spring shorter. This means that the first few shells will be lighter to load and will feed with less reliability. With a cut spring you will still get almost the same resistance when more than 2 shells are inserted.

Q: “is it possible to leave the color marker on the spring”
A: “no problems reported of leaving it in, it will take up a few millimeters of capacity though”

 

 

Additional information

Weight 0.2 kg
Version

COMPS-LIGHT 1pcs, COMPS-MEDIUM 1pcs, COMPS-FACTORY 1pcs

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