Glock Pistol - Modular Red Dot AdapterOuterImpact is excited to introduce the Glock M. R. A (Modular Red Dot Adapter). This product will allow the shooter to utilize a variety of red dot sights on their Glock with one adapter. OuterImpact has gone to great lengths to assure that the fit and finish of this system are top notch. The OuterImpact M. R. A. for the Glock answers all the above questions. The adapter plate is precision machined from 7075 aircraft aluminum. Thus, the M. R. A.