Maybe it's just my imagination but I've taken this approach with a couple of stainless revolvers with good results so I'm going to try it with the Sigma.

Goop up the working surfaces with Tetra Grease and then do LOTS of dry fire.

The surfaces that rub together will develop a gray-black goop where they wear and the teflon works into them. Stop to clean this off every now and then and re-apply grease.

The result is a much smoother pull. Once the surfaces wear in clean it all up and use a normal amount of lube.

The only downside to this approach with the Sigma is having to rack the slide for each dry fire. So I might have to do this "Tetra Gun trigger job" with live fire.

You only have to "rack" the slide about 1/4", until you hear the reset click. It's a very short stroke.

Polish the same spots that the gray/black goop builds up and then reapply the Tetra grease and the action will be even smother and it takes less time to smooth out.

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TDR911 Sigma Laser Systems

The immediate downside is that the Sigma may start malfunctioning when firing residue gets into excessive lube. It likes to run almost dry; RTFM.

The surfaces that need polishing are the metal ones in the sear block. If you take the sear assembly apart, beware losing the little springs: S&W stopped selling sear assembly components to the public.

This is a good thread on the Sigma sear/trigger:

http://smith-wessonforum.com/smith-w...ilk-purse.html

The machining, actually I think they are laser cut or water jet cut. Anyway the offending area on mine was the cutout where the pin goes up and down in the sear. Tiny little grooves from side to side. I rolled up wet sandpaper from 600 to 2000 smoothing out the ridges in steps and the grit is gone.

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US Army 1965-1971

And mine isn't really that bad. It's not gritty at all. It's not quite as good as the DA pulls on my 629 or 66 but I would say it was the equal of my Ruger SP101.

I just wish it was a couple pounds lighter but I don't want to go removing springs.

Eventually I'll try polish since I know the reduced friction can lighten the feel quite a bit.

I recently purchased a sigma too. The one I tried in the shop had a pretty smooth trigger, but the sigma I recieved did not. Could have sent it to S&W and they would have done a trigger job for free, but I wanted to get to know my Sigma inside and out so I did it myself. I polished one part at a time and it seems most of the roughness was caused by the cutout where the two pins go up and down in the sear like KywstJoe mentioned. I used a small hardend hex key to smooth it out with decent results. But I think the rolled up sandpaper idea will work better. After polishing all parts, use a strong cleaner or alcohol to remove all polishing compound and sandpaper residue from parts. I then buffed the metal parts with Tetra Gun grease. They claim it embedes into the metal pores and works even when grease layer is not visible. Sounded good since I didnt want any visible grease on the parts to collect firing residue as OKFC05 warned about. After wiping all parts dry and reassembling, my Sigmas trigger feels a lot better. Still heavy, but that doesnt feel as bad now that it is smooth.