Yup, a 3 lbs M14 trigger is a junk trigger. VERY unsafe.
Simply swapping GI, garand and especially springfield trigger parts into your trigger group does not make a safe trigger. Sear angles and engagement surfaces still must be trued and adjusted for safe and reliable function.
If you have trigger questions, before you dive in, before you spend money, email me, my advice is free. I've successfully built and tuned a few hundred chinese and american trigger groups and have had a ZERO failure rate in the 5 years I was working on M14 rifles professionally. For what it's worth and in an effort to help you guys play safe, I don't mind offering advice based on my experiences so far.