A3-21's Plasma Rifle
Complete The Replicated Man side quest and receive the androids Plasma Rifle, its the only gun i use. Lincoln's Repeater
This is a very powerful .44 cal. rifle. Go to the Museum of History and before you go through the skull doors look to the left at a double door. The rifle is in these offices somewhere, i cant remember exactly where. But it will be against a wall in a case, open this case to get one of the best guns in the game. Kill a Super Mutant Master with only 4 head shots! Ranger Armor
Complete Reilly's Rangers sidequest to unlock very good Ranger Armor. T-51b Armor and Helmet
This awesome armor, damage resistance of 50, is found at Fort Constantine. You will first need to kill all the people that Mister Crowley asks you to kill, or you can just ask for the keys. Crowley can be found in the Underworld. After you give him all the keys, kill him, without the whole Underworld seeing(follow him to the outer room). After you recover the keys go to the Fort, located in top left corner of map. The armor is at the end, after you use all of the keys. very nice!