....retainer pin and spring (which rocketed out somewhere lol).
Hahaha. Yup, I launched mine across the room when I bought my first Colt HBar 15-ish years ago And...I'm still looking for it! 
How much? This looks like a nice add on to my 9" .300BK Suppressed upper.
Hahaha. Yup, I launched mine across the room when I bought my first Colt HBar 15-ish years ago And...I'm still looking for it!
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I think there is a nice collection of those springs on the moon. I'm confident that's where those f'ers land when they go flying!
More economical to use readily available parts...



























