In terms of what makes an accurate rifle, it really boils down to barrel, trigger, and sights. Even rifles that have a weird final lockup like a FAL or weird fluted chamber like an HK can be made to shoot quite accurately. Obviously you won't shoot benchrest with a FAL, but judged against other rifles of the same weight and capabilities there isn't a person alive who can look at 5 shots on paper and say "Obviously this was shot by a FAL and not an AR-10 or Saiga 308."
Yesterday I installed a Geisselle SSA trigger on my match rifle. My rifle started as a used Colt HBAR upper to which with the help of a buddy who has a set of action blocks I added a Rock River National Match free float tube. The lower is a Rock River with A2 pattern buttstock. The sights are still stock, but I'm looking at having a gunsmith pin the rear sight for consistency. I'd do it myself but access to a milling machine or even quality drill press is lacking at this point in time.
Anyways, a quick lowdown on the SSA trigger. Very simple to install, no problems with the Rock River lower. It is obviously a 2 stage trigger, and since it is roughly half the cost of a Geisselle match trigger and meets EIC/Service Rifle requirements (4.5 pounds, no obvious external modification) it was my choice to upgrade from the stock trigger. I'm a fair shot, but not good enough to take full advantage of a Geisselle match trigger at this point, but when I am at that point I'll just transfer the SSA to another AR and upgrade again.
First impressions. Since I believe that dry fire practice is key, I ran through a bunch of standing dry fire drills and have come to the conclusion that this trigger will help me tighten my shot group. Not only is lock time cut roughly in half, but I was able to "call the shot" more easily whenever the "click" happened and I wasn't on target. The first stage of the trigger is a long pull until you meet "stiff" resistance, and the second stage breaks cleanly. Not like a "glass rod" on some of the better triggers I've used, but very clean with no grit and no additional takeup. Now I just need to get some 2000-MR powder in....
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I have the Geisselle SSA-E in my 6.5 Grendel. It's two stage as well, but its around 2.5 on the first stage and 1.5 on the last.
The standard SSE or the 3-gun variant is on my list of things to get, my carbine has a crappy mil-spec trigger in it.
The primary reason I want to replace it is not as much for improved accuracy although it should help, but increased speed on double taps.
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