Date: 5/3/2024 1:47


Crosman Piston Spring, Fits Optimus Breakbarrel air rifle

Main Product Rating 4.54.5 (9 reviews)
Crosman Piston Spring, Fits Optimus Breakbarrel air rifle

Crosman Piston Spring,, Image 1

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List Price $20.99Save $2.00(9%)
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Out of stock
Estimated in-stock date 03-19-2024. Place your order now for delivery priority!

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.


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

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Weight0.01 lbs

Average Customer Review

Rating 4.54.5 (9 reviews)
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Rating 4.04.0 4.0

Rating 5.05.0 5.0

Verified Purchase

Things I liked:

PyramydAir, ships quickly, , wished the USPS moved as quickly.

What others should know:

I bought the spring even though I don't have an optimus. I have a quest 800x. Only took a little modification to make it work. Would not recommend unless you have a small machine shop, as I do.

Rating 4.04.0 4.0

Rating 5.05.0 5.0

Things I liked:

Best solid non Buck Rogers wood stock break barrel under $150 no question.

Things I would have changed:

At this price I'm certainly not complaining, but the wood stock could have a little better finish on it. I personally found the trigger to be quite fine after using it about 50 times but when you first get it feels like it's got sand in it.

What others should know:

Get 2 before Uncle Sam goes European on us with the laws.

Rating 5.05.0 5.0

Rating 5.05.0 5.0

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.

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  • john from USA asked:

    will this fit my Quest 1000X model c1k77x ?

    • 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.

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