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.Firearm Model: AR-15Material: PolymerFinish: BlackTube Included: No