AA Arms Part #206 Spring Retainer & (Buffer Retainer) BRAND NEW OEM PARTS! NEVER INSTALLED, NEVER USED!!! EVERY AA Arms AP-9 (almost, LOL!) that we've had come through our shop has had a faulty #206 Spring retainer... It is a simple acrylic disc, which takes ALL of the abuse from what's going on inside the firearm. Once this piece gets fatigued and/or breaks, the AP-9 starts doing the "Funky Chicken"! Pieces and parts get out of alignment and next thing you know it stops working. So, tune up that AP-9 paper weight that you've been daydreaming about shooting again! We've got a few dozen of these pieces and we also have firing pins and extractors available in separate listings. We will combine shipping if you order together!