BL-2S is the model configuration, the 'S' standing for 'Speed Trigger'. They are quite light, being stocked in Baltic birch or something similar rather than walnut and have minimal bbl. ribs. The speed trigger is easy and natural to use in the field with adequate room for a heavily gloved finger in the trigger guard. They did not catch on with the shooting public here and were not popular in this part of the country. They have the same simple extractor as the regular BL2.