The CCS Pistol System by Maxim Defense is your choice for simplicity for your AR-15 pistol. This system features a Gen 6 style housing, and CCS length buffer tube. This means it is 100% compatible with MIL-SPEC bolt carrier groups and buffers & springs.
The CCS Pistol System is compatible with any MIL-SPEC lower receiver and it does not accept a stabilizing brace. For those that are looking to convert their CCS brace into the Pistol System, you only need the housing, as your existing extension tube is compatible.