CMMG recently announced their RipBrace which is a collaborative effort with SB Tactical converting the popular SBA3 to a retractable pistol brace engineered for lightning-fast deployment to personal settings. Fastback Technology was initially pioneered in the RipStock used in the Banshee releases earlier this year. To work the Ripbrace, you simply pull straight back to extend the brace. No locking tabs to bind. P3 Technology (Personal Position Preset) allows you to adjust the preset with a single screw.
In this video we are using the MK57 Banshee in 5.7x28mm: https://www.youtube.com/watch?v=aJ2ZH50fqpI
Bowers USS: https://youtu.be/LgsEht_qIPo