Silent Line: Armored Core Cheats

In some missions that I have played I have found some missing parts.
(these are hints not cheats)

the first one is a right handed rifle which is found in the aircraft
mission when you have to defend a aircraft that is carrying parts.

the second one is when you have to work as a decoy for mirage's recon
team. the part is in a dead end spot like cave.

the third one is in the mission when you have to stand on an elevator
repeatedly to go into a building destroying enemies. on the last floor
when you face the ac that comes after you destroy the mts. in the
middle of the room you will find an ac part.

the fourth one is in the mission where you have to destroy the ai
prototype. the part is a shield and is found in the room where it is separated
in 3 sections. the part is located in middle section.

For every mission you get an "A" or "S" rank on, you will get a special bonus part. The following are the other requirements to get bonus parts at the store:

Hit L3 and R3 to boost at twice the normal speed. Note that you cannot stop until you run into a wall or other object, so you may use all your boost.

Press L3 and R3 together but you cannot stop and will use all your boost