These extended basepads are the latest offering from Advance Ratio. Available in plus 3 or plus 5 models. Both work with the factory magazine spring. Stoutly built and extremely durable. The rugged design is unique when compared to other basepads on the market. A good product at an even better price. Fits Glock models 17, 22, 34, and 35. Note: these kits will not work with 10 round magazines, or with magazines for compact or subcompact model Glocks.