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The mechanics of three prototype weapons are conipared and the conformance of the weapons to the Special Purpose Individual Weapon concept discussed.; Testing procedures and results are included. because the chanism could not be made to function; and third, because the threnprojectile round produced extreme variations in velocity and excessive dispersion in the target patterns. As a result, the Harrington and Richardson system was withdrawn from the program and given no further consideration. 7 The Cal. 7. 6 2mm automatic rifle Ml14 and Cal. 0.223 automatic rifle M16 were designated as ccntrol weapons and fired in the pi:ogram to provide a comparison to the comletitive systems. The kinematic analysis of each weapon system is included In the following ordf;,: Cal. 7. 6 2mm Automatic Rifle M14 Cal. 0.223 Automatic Rifle, M16 Aircrafts Armaments, Incorporated Sprin•-field Armory Winchester Arms Division, Olin Industries. The control weapons are described in the discussiun of the methods and techniques used in testing the protnt+rpe weapons, The analyses of th? prototypes f±oln'w under seie rst. nieadings. Considering that the 4-rn purpose-,f this report is to furnish guidance for selecting the best overall SPIW system, the report is arranged into three main sections. Section I includes comparative tables of average values such as weights, impulses, moments of inertia, cyclic rates, and overturning moment arms, Also included are comparative tables of malfunctions, problem areas, and a general assessment of the competitive SPIW systems. This should furnish a quick and ready reference for members of the Evaluation Committee. Section II includes a discussion of the testing meth'ds and procedures, weapon operation, and analysis of the data. Section III presents information which documt rts those values &ivel, in the tables of Section I. Section IV contains a de t ailed series of tables showing the variations in the parameters of those weapons evaluated by IBL. CG USACDC ATTN: CDC LNO (USAMkCaM) 11, cy) CG USACDC ATTN: CDCHR-U (1 cy* CG USATECOM ATTN: AM.STE-BC (u cys', Chief R&D ATTN: Combat Materiax .sDv ' 5 cys) CO USACDC Infantry Agency (1 cr) CO BRL ATTN: AMXER-WD (1 cy)

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