DR OF An AK Magazine

GURPS, generally, does not track the DR of equipment except to figure out how to damage it.

It does have rules on p. B557 to calculate the DR and HP of objects.

A loaded, steel, AK magazine should have DR 5 and 3 HP.  That gives a Cover DR of 6 (p. B408).

A 7.62x51mm round doing 7d pi will do an average of 24 points of damage, 6 will be absorbed by the magazine and 18 will penetrate to the torso of the mook, doing 18 damage.  24 points also does 9 points (piercing damage is halved on injury tolerance: unliving) to the magazine which is enough to, possibly, kill it.

00 buck, doing 1d+1 pi will do an average of 4 points of damage.  It will neither hurt the mook, nor damage the magazine enough to make it useless.

#4 buck, doing 1d-1(0.5) pi- will do a average of 2 points of damage which is utterly useless at penetrating both the cover DR of 12 from the magazine protecting the wearer and the DR 10 of the magazine itself.  Remember; that (0.5) doubles the DR.

Mr Fleetwood's recollection of #4 Buck failing to penetrate an AK magazine in a chest rig GURPS!