While three different holt assemblies are shown in the following diagrams, they have a common configuration as far as the size and shape of the magazine curs, the boll nose» and the extractor cuts. One version is for use in the open-bolt mm and has a fixed integral firing pin. Another, which is the same length and diameter, is intended to lie contained entirely inside the receiver, making possible a closcd-bolt pistol version. The third is a full-length boll intended lor use with the original recod spring and buffer. This is the one to use if the unit is to he interchanged with the original .223 upper receiver assembly.
Even though several of the dimensions are the same lor all three, we will discuss the construction details of each one separately. This will entail some repetition but may also avoid confusion.
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