Midwest Industries Alpha Fixed Beam Stock, Side Folding, Fits AK47 and Other Firearms that Include a 1913 Stock Adapter, Anodized Finish, Black MI-ALPHA-FBSF Midwest Industries is proud to announce the Alpha Series Fixed Beam Side Folder. This easily installed stock allows the end user the ability to add a comfortable folding stock to a 1913 Picatinny interface.