The Forward Controls Design (SOLGW) ASF-90Q is a conventional (rotate 90 degree from Safe to Fire) semi auto selector with q (offset) levers. ASF was designed from the ground up to be a defense/duty/combat safety selector, its mission is quite aptly reflected by the way its levers are attached the center, via a stainless steel roll pin. The lever to center interface is immensely strong, the high shear strength (800 lbs) 420 stainless steel spring steel roll pin simply holds the two in place, and doesn't handle any load. Q levers are offset levers, by shifting the lever closer to the shooter's thumb when the selector is on SEMI/FIRE, it enables the user to more easily rotate it back to SAFE without shifting his grip. For that reason, q levers are side specific, the q lever's "leg" should always be biased towards the top. ASF is shipped with a selector spring, a KNS nitrided selector detent, two levers (or one lever, with an end cap), 4 roll pins (two are needed for installation, with 2 spares). The end cap is for those that don't wish to have a lever on the weak side of the receiver. With the end cap, ASF becomes a convertible selector (between ambidextrous and non-ambidextrous.)