Date: 10/4/2021 18:29
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PY-A-7717

Crosman Piston Spring, Fits Optimus Breakbarrel air rifle

4.5 (7 reviews)
Crosman Piston Spring

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$14.99

List Price $19.99Save $5.00 (25%)
  • 1-year limited warranty

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Crosman Piston Spring

  • Fits Crosman Optimus models CO8M22X, CO1K77X and CO1K77
  • Fits non Nitro-Piston Crosman Phantom models: CS1K77 and CS1K77X.
  • Does not work with the Youth Raven breakbarrel.

Replace the worn spring in for your Crosman spring breakbarrels. Get your gun back in shooting condition and pick one up today!

Tech Tip: Crosman informed us that this spring would work with most non-Nitro-Piston Breakbarrels, but not the Youth Raven Breakbarrel which requires a specific spring.

 




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Item Code: CR-B18-00-4D [PY-A-7717]

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Weight0.01 lbs

Average Customer Review

4.5 (7 reviews)
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5.0 5.0

5.0 5.0

Verified Purchase

Things I liked:

great spring better than the one that came with my crosman phantom

Things I would have changed:

spring works and fits great i wouldnt change anything

What others should know:

I tried this spring on my chinese spa wf600 and my crosman phantom and the spring worked great and fit both rifles perfect so i assume it would fit most 177 and 22 spring piston air rifles which is great.

5.0 5.0

5.0 5.0

Verified Purchase

Things I liked:

I bought this for a Chinese B3 to replace the broken OEM spring that was in it. I bought the rifle used and non-functioning. This spring fit perfectly and serves as a very good replacement.

Things I would have changed:

Eh, what's to change? The wire diameter?

What others should know:

if you need a replacement spring for your B3, this will work.

5.0 5.0

5.0 5.0

Verified Purchase

Things I liked:

Good price, fast shipping, did the upgrade I needed.

Things I would have changed:

Nothing

What others should know:

#makeeddiefamous

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  • CHAO from Canada asked:

    I have a Raven, could you let me know the mainspring dimension? Thanks.

    • Mark from USA answered:

      That in formation would have to come from Crosman.

  • ed from USA asked:

    Dimensions please. Overall free length, and coil outside diameter. Thanks Ed.

    • Francisco from USA answered:

      According to Mark's O.D. of 0.734 inches and proportioning with the picture of the spring, the Free Length is 10.374 inches, the pitch is 0.163 inches when compared with the Wire Diameter of the reported 0.123 inch; therefore, the mean diameter (D) would be 0.498 (OD) - 0.123 (d)= 0.375 inch ;henceforth, the spring index (C) = D/d = 3.04878 'Wow!' that is one stiff spring for being so long, but definitely due to the large wire diameter. Now the spring rate (K) = d^4 x 11.5x10^6 / (8 x D^3 x 34) = 183.5 lbs/inch, no wonder the spring is so long; else, you would have to jump on the barrel to cock it. Less active coils, smaller wire diameter and larger outside diameter makes a spring less stiff and vice-versa. Lastly, the solid length, completely compressed is 4.305, inches, so the maximum deflection (S) is approximately 6 inches, which sounds about right when K=180lbs / 6 inches = 30 lb cocking effort. Cool?

    • Mark from USA answered:

      The spring has 36 coils-I.D -.498 W.D. .123 O.D.-.734 The length varies.

  • sunny from USA asked:

    My air rifle is Ruger Impact 22cal. I need to replace its broken pistol spring. I just wonder if it is fit for my air rifle. Please reply so that I decide to order it or not. Many thanks.

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