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Ships within 48 hours · Estimated delivery Aug 5 - Aug 10
For Your Every Summer RSVP, with Code: SUMMER15
Description
VSR Concave Bucking 40º (Black)Material: Silicone rubber Hardness: Shore A40 (black) Compatibility: VSR 10 chamber Only works with Airsoftphilosopher barrels. Recommended FPS: 200600 fps (equivalent to 0. 4 3. 3 joules) Perfect fit in the Airsoftphilosopher hop up window Having a high quality, properly cut inner barrel inside your airsoft replica is important, but even more important is their compatibility with each other. If the cut does not perfectly match the hop up window of
Material:
Silicone rubber
Hardness:
Shore A40 (black)
Compatibility:
VSR-10 chamber
Only works with Airsoftphilosopher barrels.
Recommended FPS:
200–600 fps (equivalent to 0.4 – 3.3 joules)
Perfect fit in the Airsoftphilosopher hop-up window
Having a high-quality, properly cut inner barrel inside your airsoft replica is important, but even more important is their compatibility with each other. If the cut does not perfectly match the hop-up window of the barrel, or if the chamber applies downward pressure in the wrong place, the hop-up bucking cannot reach its full potential.
That is why we carefully design our products to achieve the best possible results when used in the correct setup.
As shown in the image, the patch covers the entire length of the window, while still leaving a small gap so the patch can move up and down without tension. Even the barrel edges are chamfered for longer service life and sufficient space for downward movement.
Designed for Maximum Performance
The concave bucking is designed to reach the physical limits of accuracy and range. It provides a 6.6 mm long contact patch to perfectly guide the BB and apply precise backspin.
The best results are achieved with the Airsoftphilosopher VSR chamber or the Maxx Model AEG chamber with a concave nub.
Note: Most chambers are not designed for large hop-up windows and bridged barrels. Make sure that the hop-up arm and nub apply pressure in the correct position.
Perfect air seal
Each hop-up bucking has two main tasks:
Applying perfect hop and providing an air seal.
Therefore, the feeding lip of the Airsoftphilosopher concave bucking is tighter than other buckings to provide a perfect air seal. The special design reduces feeding issues.
Additional 3D printing on the exterior improves the tight fit inside the chamber.
(Each chamber has slightly different dimensions, so if the air seal is not optimal with your chamber, wrap one or two layers of Teflon tape around the outside.)
Specially developed material
The durable silicone rubber is designed to create perfect friction between the BB and the bucking. The large contact area of the patch allows you to use a very soft bucking that creates a perfect air seal and is still capable of lifting heavier BBs.
Due to the special compound, the silicone rubber has greater compression stability and reliably returns to its original position even after prolonged use.
Polished surface
Each bucking features a polished surface to provide maximum tolerance and consistency.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 4
Great kids book
Format: Hardcover
These books are nigh unbreakable in toddler hands. The book is cute and the noises are great
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
★★★★★ 5
Fun, Interactive Sound Book for Toddlers
Format: Hardcover
My daughter loves this book and especially enjoys pushing the buttons to hear the animal sounds. We aren’t quite old enough to match the pictures to the buttons yet, but she has so much fun pressing them and mimicking the animal noises, which makes this a great early learning experience.
The bright Eric Carle illustrations are engaging, and the interactive buttons keep little hands busy. A wonderful toddler-friendly sound book that grows with your child and encourages sensory play and language development.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 27, 2026
★★★★★ 5
Great Book for Engagement and Following Directions
Format: Hardcover
Great book! I use it to teach animals and following directions, and it keeps the kids engaged. I covered mine with contact paper because it is delicate. The pages are nicely printed with a glossy finish, but they are made of thin paper.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
★★★★★ 5
My grandson starting @ 6mo loved the sounds. He still loves the book now @ 2yo.
Format: Board book
Beautiful & Brilliant colors, well made book. The battery is still going strong after 2yrs of use by my grandson.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 19, 2026
★★★★★ 2
What a disappointment!
Format: Board book
What you see is what you get. You pay all that money just to get a handful of unexciting sounds. What a disappointment!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2025
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