The Huber is a two stage(did not realize they made singles). They adjust down to 1.5lbs total. It does not have a bottom bolt release. The Triggertech field is essentially a Primary but only claims adjustment to 2.5lbs(in the action I had it in it went to 2lbs). Depending on action the primary can adjust down to 1.5lbs. They are for 700 clones. They do not have bottom bolt releases.