If you enjoy a small laugh, here's the blurb on the "Huber Concepts" Krag trigger -

30-40 Krag-Jorgensen Trigger

The 30/40 Krag proved its effectiveness in the hands of the Marines of Teddy Roosevelt’s “Rough Riders” at San Juan Hill. Originally of Danish/Norwegian design, with a side load magazine. Huber’s Triggers with patented ball bearing technology provides better timing aspect in shot delivery sequence. Provides adjustability’s for creep, set, and over travel. The 30/40 Krag is only available in black Teflon finish. Typical short duration break weight at 2-3# on drop in, and replaces the trigger component only. Minor wood relief may be required.

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Parashooter,
Wowsers, that Huber site is a mess. Afraid to stay on it long as there might be viruses lurking. Maybe the site looks different with a different browser. Did not know of any available triggers till your link. If that Huber site is for real that could be a plus for sporter shooters.
Reading the Huber ad again the first part is just historical notes and the second part is about his trigger?

The basic problem with many schemes that eliminate the first stage of a trigger designed as a two-stage is that this can leave very small sear engagement, possibly enough to allow vertical play in bolt assembly to disengage sear from striker if rear of assembly is lifted just slightly. Unfortunately, lifting the bolt assembly can occur as we disengage the Krag* safety! Result: accidental discharge when the safety is turned to the "OFF" position. Not a desirable outcome.

Effective single-stage triggers for quality bolt-action rifles normally incorporate a "propped sear" design to provide generous sear engagement with that floppy bolt assembly by engineering a mechanism that releases the sear so it pivots away by mainspring pressure. Image below shows a recent Winchester example.

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*My late-production Norwegian M1912 Krag features a nifty spring designed to keep upward pressure on the "cocking piece" to eliminate vertical play and enhance a consistent pull. I don't know if this is common to all M1912's or not - but would like to learn if it is/isn't present on other Norse Krags.

FredC wrote on Dec 11^th, 2019 at 11:28pm:

Rivet.

Interesting.  I have a 1916 made action that has the spring.  I looked at the Stomperud, originally an 1897 Steyr action and noticed for the first time that there's a screw where the rivet is in para's pic.   It bears on the rear of the trigger and has a range of motion of about 1/8".  Adjusting the screw down (turn right) takes out most of the first stage.  I've been playing with it some, it has a bigger range of motion than what I originally thought.  So far I have all the first stage taken out.  I guess the guys at the US Armory missed this feature!  Thank you fellows, now I have an adjustable single stage trigger.  Vertical bolt movement in the action is minimal, but I won't adjust it down enough that I don't have good sear engagement.  There might be a hint here for US Krags, least the sporterized ones.

for the shooters that have the sight mounted on the bolt knob that spring under the bolt would limit the amount the sight moves. That would be a big plus not having the sight move as you pull the trigger.

butlersrangers wrote on Dec 11^th, 2019 at 7:03pm:


FWIW, my 1898 had some drag in the trigger, caused by some scratches in the engagement components.  I spent some time with fine, very fine and strap stones and it smoothed right out and is a respectable 3.5 lb pull!  It can be done... and is absolutely CMP legal.