The Timney is 4# but I'm not sure what the AR-Gold is, I think its about the same.
Trigger pull weight is only PART of the issue that makes a good trigger. If your goal is to only get the lightest trigger pull then you will be missing the point (and the target). It makes up for a lot of sins in the trigger, and it is important to a point, but its not the Holy Grail.
Take up, crispness of break, over travel and reset also play into the equation of what makes a good trigger. One of the things that AR-Gold did with their trigger system was they totally redesigned the fire control mechanism of the AR-15. All the other triggers, whether they are Timney, Jewell, Gissel, JP or any other brands basically used the existing AR15 mechanism, modernized or tuned it, but none of them reinvented it so all have somewhat similar characteristics which the AR-Gold does not have. Its easier to try them side-by-side than to explain it.
Im looking to build a target AR as well. I was looking at the Yankee Hill Machine 7.62 uppers but maybe I should piece one together with better parts! Thanks for all the info.
How big of a factor is the upper and BCG in a target AR? I'm looking to build a versatile 3-gun type AR, but I'm a lefty. If I go with a lefty upper and bcg, I'm pretty much limited to Stag or Stag (in my price range).
Upper is actually of fairly little importance so long as it is all trued up. BCG is of modest importance for accuracy but higher quality (coated with some of the high tech finishes) may yield greater reliability. Buy the best you can afford but don't expect dramatic results by going from a low to a high priced BCG or upper. I believe the barrel and trigger are the 2 most influential factors and that is where you should spend your money.
Think of it this way, a fancy buttstock is nice, but if you can't afford it a standard military fixed stock will do. A really expensive free float tube is nice, but imparts no more aid to accuracy than a low priced free float tube.