Quoted:
1dreamer,
I started out with this hammer spring modification, but I eventually invested in a good two-stage trigger (Rock River). While the trigger pull is lower after performing this modification, it comes at the price of weaker hammer spring pressure. This has two effects, an increase in the possibility of failure to ignite primers and an increase in action "lock time". While the trigger is easier to pull you have to hold the rifle steady longer afterwards (during the follow-through), since it takes the hammer longer to fall with the weaker spring. Just something to consider.
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This is all potentially true. However, I've put about 600-700 through my rifle since 15 minute trigger job. Not even one single fail to fire due to weak hammer spring. As far a lock time, when you reduce the weight of the hammer, this quickens the pace quite a bit. Can't tell a difference between old and new lock time. Accuracy increased, did not decrease due to long lock time.
In addition to the 15 minute job, I added a set screw up through the grip screw hole to take up much of the slop from the trigger. Gotta be careful here though, fine line between all the slop is gone and the double tap syndrome.
All this being said... Nothing beats a really nice aftermarket adjustable trigger. But, since they start at $120 and go up, this is a fun, and cheap alternative.
15 minute job - free
set screw to take up the slop - $.24
The experience and fun of working on your AR-15 - [b]PRICELESS[/b]