My stock trigger on my AR15 was gritty and pulled a 6.5 pounds.
I did not want a competition trigger or want to spend over $150
for a trigger kit.
I ordered a Toms Tactical Enhansed Nickel Teflon Trigger group
and a set of JP 3 1/2lb trigger springs group. It was a quick install
and what a difference. Out of 200 rounds I did not have any mis-fires
due to the light springs. The trigger pull is now 4.6 lbs and smoooooth.
The Trigger kit was $38 and the JP Springs were $12. You just can't
beat that upgrade for $50 and 15 minutes install.