A few friends and I were playing Dark heresy when the GM stated we couldn't use the charge packs of the lasguns of the enemys we had just killed. We thought this was wrong. We had a heated discussion about why, and why not, we could use them. To paraphrase the argument it went somthing like this:
GM: Since diffrent areas of the galaxy have different forge world manufacturers it makes sense that charge packs from a sector will not fix a lasgun from a different sector. (us being agents of the inquisition we have martian guns and being in the calexis sector we cant use their charge packs)
Group: That is wrong as Mars and the Mecanicum have the STC (standart template construct) and it is distributed to the imperium galaxy wide so that if, say, an imperial guard batallion were to fight in a different sector, they could use the sectors' charge packs if their own ran out.
GM: No as during the dark age of technology / age of strife the planets have stopped talking to each other and developed their weapons according to thier surroundings. For instance a desert worlds' lasgun would function differently to a ice worlds lasgun.
Group: Two things; 1) High Tech priests still go to mars to study and use the base STC, and 2) The weapons would function differently but the charge packs wouldn't as the charge packs are designed to act effectivley in all terrain, and "don't fix what isn't broke".
GM: No. (This I feel was his most balanced argument)
At this point we had to carry on and drop the argument as time was ticking on. I spoke to the GM since then and he still thinks he's right.
This argument is not about the dark heresy rules (with clearly state that charge packs fit all but the GM decided to ajust it and make it a "house rule" that its wrong) but an argument about the 40K fluff in general.
If you have a different opinion, feel free to state it as a reply.