imschur Posted May 23, 2013 Report Posted May 23, 2013 Geissele Super Gas Block - The Geissele Super Gas Block (SGB) is a low profile gas designed to fit under most free float rails. The picture at Brownells shows the SGB as silver in color. The description states black stainless steel
planeflyer21 Posted May 23, 2013 Report Posted May 23, 2013 Looks like it is designed for use of set-screw or pinned retention, or a combo of both? Jon
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