Photo 22 of 68, Colt Model 603 (XM16E1, M16A1 Army)

Original 601 type bolt release had a serrated flat at the bottom, the next style (shown here) added a small extension at the bottom but still had the serrations on the angle, the next (& still current) style has no serrations on the angle.

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XM16E1 interim bolt release Original 601 type bolt release had a serrated flat at the bottom, the next style (shown here) added a small extension at the bottom but still had the serrations on the angle, the next (& still current) style has no serrations on the angle.
Photo 22 of 68, XM16E1 L Actn Intermed Bolt Release.jpg, 80KB, 461x659, 2310 Hits Other Sizes: Original
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