Questions on the Heller VAB 6x6 + Armaments

Modeling Subjects Armor
1

I’ve been looking at the Heller VAB 6x6, and although I hear it isn’t the nicest of kits, both the interior and fairly extensive exterior PE sets from Eduard are on sale for only $5 each, so I’ll probably pick them up. I could only find one close up of the barrel included in the kit, from Eduard PE’s website, and from what I could tell in the picture, the kit barrel is basically shaped like a broomstick, with a rounded end and no hollowed muzzle. I’ve been searching for information on what kind of gun it is so I could look into an AM replacement part, but I couldn’t find anything. Can anyone ID this gun/barrel, and is there any AM replacements?

Here’s a pic:

Thanks, Ian

2

Looks like the .50 Cal M2 to me. (?)

3

That’s what it looked like, but with no muzzle break, I thought it might be some weird variant or something?