The patented Widget™, Step-Widget™ & now the GBT-4™ are fixtures designed to reduce the time required to assemble the gas block and gas tube used in AR-15 pattern rifles and pistols. We know that anyone who has used the “3 hands & no grace” method to pin the AR gas tube into the gas block will appreciate the tool. Please check out Saint Michael’s Armament’s how to do it Youtube videohttps://www.youtube.com/watch?v=gL_ rf01b0hs & website.
- The SMA Gas Block Tool (GBT) product line will accommodate all set-screw and clamp style gas blocks. The GBT was invented, developed, patented, and is marketed by Texans. The SMA GBTs are machined in the USA from USA made AISI 4130, 4132 ordinance-grade steel, then receive a carbo-nitride surface treatment resulting in a surface (curvature corrected) Rockwell C hardness of 35. As a reference, Mil-spec ANSI 4130 (most AR barrels) has a RWC of <20.https://en.wikipedia.org/wiki/Carbonitriding
-The GBT-4 covers all 4 gas block journal dimensions in the AR-15 market.
-The Two-Step Widget™ (GBT-625750) covers both .626” & .750” journals.
-The Bull-Widget, GBT-875936, covers the 0.875” and 0.936” bull barrels.
-The cost effective GBT-750 will cover 90% of the off-the-shelf ARs.
Note that shipping cost will apply ($9)
Sales tax will apply to Texas residents. Sorry about that.