Hard Targets has the extended magazines, and a few other choice mods including chameleon coating and stock removal. Rating 1 Extended Mag costs 35¥ and adds 50% more rounds and adds +1 to concealability, while the Rating 2 costs the same and adds 100% more rounds but adds +2 to concealability.
I've got a single spare clip for the AK-97 and 4 extended ones with 76 rounds in each, that way I can keep the conealability low and just swap to a high-cap mag when necessary.
And yeah, you have the same issue I have; I'm having a hard time with an infiltrator without the hardware skill, but I just can't find the points for it, so something has to give.
CraterShip
I noticed that I'd forgotten to pay for the electronic parts to modify my commlink, so I've swapped some gear around. Dropped the winch on the truck and the gas mask, got the electronic parts, a few micro-cameras, and a bug scanner. I also swapped the martial arts technique for Counterstrike, as 7 karma for a +1 dice to block just isn't worth it. Finally, updated the knowledge skills after ditching Small Unit Tactics. I think that's the final revision, and I've updated the chummer file in the character post.