It is actually consistent.
Pgrens - if a guy with Schreck dies, the Schreck gets dropped/destroyed. You need to pick it up or re-buy.
A 4 man squad has 2 shrecks, if for example 2 guys holding the shrecks die they get passed over to the 2 remaining pgrens. If the 3rd pgren dies there is a chance the shreck drops because there are 2 handheld weapons for only 1 person. The first and second death of a pgren squad NEVER drop a shreck.
Guards - if a guy with DP lmg or PTRS rifle dies, it gets dropped/destroyed. You need to pick it up or re-buy.
Same as for pgrens, it is just that guards have 2 handheld weapons (or 4 with the dp upgrade). This means that when the 3rd guy dies there is already a chance to drop one weapon. The first and second death never drop a weapon again.
LMG Grens - if the guy with the LMG dies, another LMG spawns in the hands of another squad member.
LMG only takes up one weaponslot, so only the final death of a gren squad has the chance to drop the LMG. This makes it a very safe upgrade as well.
It get so far that when you kill the squad one by one like this there are FOUR LMGs lying around...mental
No, there is just one LMG
(just for the record the final member has a chance of dropping it, btw if you upgrade Grens with LMG and G43s, then 3 upgraded members die and the one with kar98k retreats, the reinforced members get another LMG/G43s.
Yes because weapons get transferred over when the holder dies. G43's can't drop but I don't know if this means the LMG can get dropped already when the 3rd guy dies.
PPSh and g43 dont drop.
The only inconsistency is the chance of the flamethrower blowing up regarding weapon upgrads.