I have two MBT's. Larue says they pull at 4.5 pounds with the light spring, but it felt lighter, just like my SSA-E. So I pulled out my trigger gauge and tested both MBT's and they both pulled exactly and consistently at 3.5 pounds. To me it feels almost identical to the SSA-E except for the wider, flat trigger on the MBT. I got them on sale at Larue for $99 each. Well worth it imo. Excellent construction and quality, made from strong S7 tool steel.