For the railgun I request that at full power the slugs pierce through ground as well as concrete. A 20mm slug moving at roughly mach 18 (a decent railgun capacitor should be able to allow for the electricity) to fire that slug through the ground. The primary reasons why in real life it would have a high difficulty would be the errosion of the projectile because of friction and the fact that soil is dense as s#!t. It should be possible with a strong enough material though, as long as it is not around a hundred meters thick of soil it should work.

The general request was for the weapons not the be cocked every time they are taken out. They only need to be cocked right after you feed in the magazine so the round will be taken into the barrel and all the extra time it takes to take out the weapon and cocking it (cocking the gun when it doesn't need to be would spend one round) could mean life or death.