Colonel Autumn's Laser Pistol (Fallout 3)

Summary
A weapon found on the Enclave Leader, Colonel Autumn. Bears very similar resemblance to the standard laser pistol. It is probably the single best weapon in the game because it is fully automatic, does 37.5 damage per shot (75 damage per VATS at 2 shots each), has a 30 round clip, runs on easy to find energy cells, uses very few action points, and is repaired with the common laser pistol.

Weapon Details
Colonel Autumn's Laser pistol is a modified, fully automatic version of the standard pistol.

The laser pistol does 75 damage, a drastic increase over the normal Laser Pistol, while using the same Energy Cell ammo as a standard pistol. This version also has a weight of 2, compared to the standard version's 3. This unique pistol is considered a Quest Item; similar to Donovan's Wrench, and cannot be dropped or removed from the players inventory in any way.

The weapon (being a quest item) can only be repaired manually.

Getting the Weapon
It is possible to get this pistol and use it in the wastes. You must be a little careful to leave the Take it Back! quest in the correct state, otherwise you will not be able to leave the Rotunda with the weapon.

It is only found on Colonel Autumn in the Jefferson Memorial Rotunda during the final quest. As such, unless you cheat to get it, the only way to get it on the console versions, is to glitch up a rock and get through a tiny opening in the barrier and kill him prematurely (after speaking to Elder Lyons and before launching the assault) and leave, there is no other way to get it. It is possible to jump between a gap in the laser fence and the high scaffolding like bridge. Sometimes Colonel Autumn will drop his pistol after being killed. You can also shoot his arm, causing him to drop the laser pistol, using V.A.T.S and take it and leave without killing him. The way to get around the force field barrier can be seen in this video: http://www.youtube.com/watch?v=ad8HUcxKUSs *Warning, this video contains many spoilers*

Colonel Autumn is only in the Rotunda after you have started the Take it Back! quest. You must take the option to prepare for battle when speaking to Sarah Lyons, thus leaving her in a waiting state and not causing her to order the launch of Liberty Prime and begin the assault. You can then go to the Jefferson Memorial and find the Colonel (if you go before this, he will not be there). If you go after the assault on the Memorial, the doors lock behind you and you can not leave thus making it so you have to end the game and you do not get to use the pistol elsewhere. If you get it early, then you are able to have his clothing and his pistol for use out in the wastes.

Important note: If you kill Colonel Autumn, when you return with Sarah Lyons, he will still be dead and you will have to start firing on the enclave soldiers in order to start the last part of the game. NOTE: If you pickpocket the ammo after glitching in, leave the room, and go back in he will have un-equiped the pistol, allowing you to pickpocket it.

It may be possible to get this weapon when the new DLC pack Broken Steel comes out, as it expands the story line of the game.