This adjustable spanner wrench is a great add to your cart for your SDTA mounts to tighten them (mount in photo not included).
XS Spanner Wrench - Flat Surface
DEAD AIR ENHANCED SPANNER WRENCH KIT
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Radian Raptor LT Ambidextrous Charging Handle (AEG/ERG) Red - PTS
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Radian AR-10 Silencer-Optimized Raptor-SD Ambidextrous Charging Handle
SPANNER WRENCHES & BRACKET