The GL-Core S was specifically designed for one of the best Israeli Counter-Terrorism units, to be used as a primary buttstock. The design process started with the GL-Core buttstock, and implemented all the design changes that were requested to create a buttstock that will be short and compact for CQB scenarios but will still provide strength and stability for mid-range engagements. It utilizes interchangeable buffer tube adapters for a tight fit on Mil-Spec and Commercial buffer tubes.