Geissele Automatic’s Super Modular Rails (SMR) are popular for good reason. They are excellent rails. Wouldn’t it be nice if there was an upper receiver available to match the contours of the SMR? SMOS Arms thinks so.
They recently gave us a sneak peek of a billet upper they are working on that will have contours designed to blend into the SMRs. Hopefully for SMR fans, this upper received actually makes it to market.