I have the 45 and never really found it that reliable. The first thing I had to do was remove the magazine safety mechanism as it was constantly binding up.
The mag release and bolt hold-open are ridiculous and certainly not designed for intuitive use.
Detail stripping is a nightmare, but doable.
If I was to suggest anything other than the above tips, it would be to watch the condition of your hammer strut and hammer strut bridge. Flimsy sheet metal bends like you wouldn't believe!
Were I to do it again, I would save the money for an AR or SKS.