10 example of terminologiesShadow Systems. $999.99. Be the first to review this product. Due to restrictions this item is available for in-store purchase only. Details. Mr920 Elite Optic Threaded. You currently have a pre-order item in your cart. To add this product to your cart, you will need to remove the pre-order item (s) or create a separate transaction. Mimecast support levelsThe DR920 slide is designed for manipulation under stress, with directional serrations in the front and rear (as well as topside on some models) and a thinned profile at grasping locations. The match-grade barrel is conventionally rifled, spiral-fluted, and available threaded or unthreaded. The drop-safe, flat-faced aluminum trigger has a 4.5-5 ...