Looking for the ultimate modification and performance upgrade? Common AEG buckings stock in AEG or off the shelf, are a bit loose in terms of inner diameter causing the bbs to not sit "dead center" in the hopup. The Angel Custom buckings are made with higher quality materials and thus provides much better grouping, range and accuracy! Try this bucking on your KWA, or against fire-fly, PDI, you will not only see an increase in distance, but also accuracy and better grouping! The Angel Custom "Sniper" Hopup bucking series aren't your normal hopup bucking. It is made with the highest level of specifications like all other Angel Custom products. This bucking features a H.D.S. silicone that is much more costly and rarely found in normal AEG buckings. The V-Shape teeth technology defines the nub on the inside of the bucking in an innovative way to better guide the BB in a more controlled direction resulting in better accuracy and range.FAQ: Angel Custom "W" bucking and "V" bucking? The Angel Custom V-Type bucking is dedicated to optimizing the accuracy of a 6mm Airsoft rifle achieving minimum grouping and maximum accuracy (best for the silent players that wants each shot to count). The Angel Custom "W" type bucking serves similar purpose but focuses slight heavier on durability over grouping for the trigger-happy shooters (best for players who are always in the front-line of the battlefield and CQB environments). Both the Angel "V" and "W" buckings are made with top notch material superior over a stock bucking able to take on constant fully automatic firing and the small differences described above only demonstrates the amazing amount of dedication the Angel Custom lab designers put into making the most awesome upgrade parts.Features: Built-in "V-Teeth Technology" for greatly enhanced accuracy and range. Made with high grade low / high temperature resistant H.D.S. silicone 500% more wear resistant over normal hopup rubberCompatibility: For Marui Style VSR-10 / Gas Pistols (excluding M92F). For all WE Open bolt system Airsoft Gas blowback rifles (M4, M16, SCAR, PDW, M14....ect) Type: Soft Package Includes: Hopup Bucking Materials: H.D.S. / Strong Tenacity High Density SiliconeManufacturer: Angel Custom. Designed in Japan.