Photo 6 of 68, Colt Model 603 (XM16E1, M16A1 Army)

Here you can see the early style firing pin retainer, the small chrome circle about mid way just under the rear of the carrier key, this was later changed to a much simpler retainer that resembles a small cotter pin.

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XM16E1 L Bolt group left side Here you can see the early style firing pin retainer, the small chrome circle about mid way just under the rear of the carrier key, this was later changed to a much simpler retainer that resembles a small cotter pin.
Photo 6 of 68, XM16E1 L Bolt group.jpg, 90KB, 1258x417, 2735 Hits Other Sizes: Original
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