I speak only from hands-on first-hand experience.
I have a 2 year old SP Defender, several older Mil-spec Springfields and 2 older West Hurley Auto Ordnance from the early 80's.
All parts are interchangeble, I have used all in competition ( with and without Compensators, extended safeties, with all different Loads of bullets and powders )
except for the new Defender, with never a problem, I do all my own work, BUT because they are all Mil-Spec 1911's there was virtually No work needed.
I have used Non-OEM parts in All, even the Defender with no problems what so ever. Two of the Springfields were new < late 80's early 90's < when acquired,
the two year old Defender is Not Brasillion IMBEL.
The older Used 1911's ( SP and Auto Ordnance) referred to in this post shot and functioned just as well as the 3 new guns.
I have No experience with the New Auto Ordnance 1911's made by Kahr OR the newer Springfields partly made in Brazil.
The older SP were Forged frame and slide, the newer IMBEL Brasillian models are forged slide But my memory fails me about the IMBEL frame,
I think they are cast, I await correction.
You might consider an older used SP or Auto Ordnance made in West Hurley, NY. I have read many negative "opinions" about the old West Hurley AO from guys that just
repeat what they heard or read --- an opinion is Useless and fraudulent if it Not based on Hands- On First-Hand knowledge and experience.
Good Luck, M A G A
togl isdl