If you are capable of removing the existing trigger group and installing a replacement (YouTube is your Friend), I suggest you look at options provided below.
I have installed Velocity (3 lb) triggers in some of my rifles, and love them; company Owner used to work for Timney. Their standard triggers are great, and the MPC variant is perfect for my Spider Monkey digits.
Like you, I had a “Standard” trigger in an Anderson Arms lower that weighed in at 7+ lbs. Popped out the old parts and installed an ALG as listed in the first link. Remarkable improvement at just a hair under 4.5 lbs and super smooth. By the time you ship your trigger out, pay for modification and return shipping, you could be ahead by just ordering this one.
ALG:
The ALG Defense ALG Combat Trigger (ACT) is an enhanced Mil-Spec type AR-15 trigger. The ACT is very similar to Mil-Spec units in pull weight, but the...
www.midwayusa.com
Velocity:
Velocity Triggers are match grade, single stage, drop-in triggers for the AR platform. All Velocity Triggers are coated with Armor Lube DLC. ArmorLube is a next-generation diamond-like carbon firearm coating that makes all other wet lubricants obsolete and maximizes weapon performance...
velocitytriggers.com
Another option:
The AR-STONER Two Stage Enhanced Trigger Group for the AR-15 and LR-308 (Small Pin .154") is a mil-spec replacement trigger group featuring a...
www.midwayusa.com