This CMMG, Inc AR15 Lower Pins and Springs Parts Kit includes all the spare parts you need to fix up your lower receiver. Everything included in this Gun Parts set by CMMG, Inc either meets or exceeds Mil-Spec quality. We know how easy it is to lose a spring. With this CMMG, Inc 55AFF75 AR15 Parts Kit, you can easily replace springs and pins that are tiny and may fly away at any second. Skip the frustration of losing a tiny part and have this CMMG, Inc AR15 Lower Pins and Springs Spare Parts Kit on standby.