This is a semi-automatic-only version of Geissele Automatics’s Super Select-Fire trigger. The large pin dimension is 0.169 inches, whereas the standard pin dimension is 0.155 inches. The SSA® Large Pin is a non-adjustable combat trigger that is a precision two-stage trigger and allows precise and accurate trigger control. The SSA’s® two-stage design allows the trigger to be light enough for accurate and precise shots, but forgiving enough for CQB. The SSA® is safety certified by Crane Naval Surface Warfare Center. It is recommended for demanding applications such as Law Enforcement use, Close Quarters Battle (CQB) and mid-range carbine work.