Take a look at World's Largest Supplier of Gun Parts, Gunsmith Tools & Shooting Accessories - Brownells
I normally buy parts from them, and they do have kits from different manufacturers of decent quality.
There are several parts that make up a good trigger pull on a 1911. Mess one up, and you could have a surprise when shooting.
In other words, be careful.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)