difference between trigger groups

[A6TONY]

Other than the obvious bottom metal being different, whats the difference between a M1 trigger group and an M1A trigger group?

[Gtek]

The housing is of coarse diff for mag. Hammer, strut, spring/housing same.
Trigger same- sear diff 14 had disc. Safety same, safety spring diff. Hammer, trigger pins same. If you have an M1-A the later versions have the inject cast
internals. Some very pourous. Hard to get sweeeet trigger. M1 guts will work great and thats what I always replaced with and give them theirs back in a bag.
Why do you ask? - Gtek

[A6TONY]

I inherited a lot of M1 parts and a M1A that is very good condition but minus the trigger group. Just trying to put together the m1a at low cost to me. Thanks for the info I thought they would be the same from what I rememberd as a kid watching my dad work on them.