BAR magazine questions

[milsurp_scout_14]

I recently bought these 3 mags which were supposed to be WW1 USGI for the BAR (very cheap). Two are what I'd describe as a black-blued finish (each marked with an 'E' on the spines), and one is greyer with remnants of parkerizing on it (devoid of any markings except an 'M' on the follower). The grey one also has a strange lip on the front, and a hole in the floor plate.

I dis-assembled all three for cleaning, as they were caked in cosmoline. I noticed one had the follower partially sticking out the top, and thought nothing of it. Once cleaned, I re-assembled. The two black mags went back together fine; however the grey one would not take the follower--on further examination, this follower was too long to go into the mag (likely why it was sticking out in the first place). It was bent at some point, and even that didn't let it wiggle in.

 

My three questions: Is the grey parkerized mag actually for the BAR?

Are these all actually BAR mags, and if so, how do I tell the age from the markings?

Is the long follower even for a BAR mag?

Thanks to anyone who has answers. This is my first foray into these mags--just wanted some to put into my belts!

Below is the grey parkerized mag/parts.

 

[milsurp_scout_14]

Here's the two black mags fully assembled. Both marked with an 'E' close to the bottom of the spine.

[iron bender]

The two blued mags are USGI magazines, the one with the applied lip may be Israeli DROR mag. Possibly converted USGI... my bro's big into BAR's, his analysis