Shifting into1st - what could cause it to pop out or make grinding sound? on 1994 BMW 318i

I just purchased this little green 1994 318i for a gas saver. The guy said it had a positive first gear...I say now "ha it. Means ...make sure you heave it in first a
!!! Sometimes smooth as silk for all gears...sometimes not. Just wear? It has about 150k on it.

Asked by for the 1994 BMW 318i
Sounds like a internal transmission synchronizer problem. I recommend having a trusted repair shop give you an estimate on repairing or replacing.