[protest1]

Plenty about uparmoured and upgraded an M113's at the following link.
Warning it's a long load, lots of pics.

http://www.geocities.com/equipmentshop/m113combat.htm

[Spktyr]

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The uparmored M113's are still pathetic. A .50 will easily ventilate any of the uparmor variants, and they still have inadequate undercarriage protection. A hand grenade can kill one.