I have several MBT-2S's and one MBT-1S.
In terms of other single stages I've used ALG ACT, PSA EPT, and run of the mill mil-spec.
When I first shot the MBT-1S, I didn't like it, it was, for lack of better terms, too smooth and too light. Apparently I'm used to two stages and/or the heavier mil-spec with a bit of grit/creep, as I was touching off rounds before I intended. I felt absolutely no grit/creep.
I installed the heavier trigger spring and I felt pressure enough against my finger that the trigger became immensely more usable.
If you don't want a two-stage, I'd give the MBT-1S a try - use the heavier trigger spring.
Patriotism means to stand by the country. It does not mean to stand by the President... - Theodore Roosevelt, Lincoln and Free Speech, Metropolitan Magazine, Volume 47, Number 6, May 1918.
Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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