20mm question


#1

This is a 20mm dummy M51A2. All solid metal. Why is there a movable core, what’s the purpose? I can feel it move when I shake it.
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#2

Vlad,

Perhaps to simulate the shifting mass of the uncompressed powder charge for realistic cycling through gun feeds and actions?

Dave


#3

Vlad, it is certainly for weight purposes. Your cartridge here is not solid. It is a case with a crimped projectile.