imschur Posted May 23, 2013 Report Share 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 Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted May 23, 2013 Report Share Posted May 23, 2013 Looks like it is designed for use of set-screw or pinned retention, or a combo of both? Jon Quote Link to comment Share on other sites More sharing options...
Goofball310 Posted May 23, 2013 Report Share Posted May 23, 2013 Also looks to be non-adjustable. Quote Link to comment Share on other sites More sharing options...
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