One way to get your hands on the exotic Pulse Rifle the Pocket Infinity is by completing it's exotic bounty, Shattered Memory. The bounty has 8 parts that will have you doing everything from killing a Gate Lord, to killing 200 enemies with just a fusion rifle. To complete it all you're going to need some skill and some patience, which is why we've including some tips along with the complete step-by-step walkthrough to Shattered Memory below. 

Step 1: Obtain a Damaged Ghost from Venuses Shattered Coast 

To pick up the Damaged ghost, start a new patrol mission and head to the Shattered Coast area. Once you're there, look for the large statue of the winged woman pointing out toward the cliff. In the building behind her and to her left you will find the damaged ghost in the first room's corner. 

When you've got the ghost, return to the speaker to begin the next step. 

Step 2: Kill a Vex Gatelord with the Heroic Modifier Active 

Your only real option here is to complete the "Eye of a Gatelord" mission. Make sure you have the heroic modifier on when you start or it will not count toward the bounty. Destroy the Gatelord and you are ready to move on. 

Step 3: Bring the Ghost to the Speaker to Obtain Fusion Rifle Schematics 

Killing the gatelord will restore the ghost, which you can now deliver to the speaker in exchange for the fusion rifle schematics. 

You can then bring those schematics to the Gunsmith to turn in for a Depleted Exotic Weapon core, which can only be charged by dismantling 10 rare or higher quality fusion rifles. To make sure you have enough to get the job done, save all rare fusion rifles you get your hands on as soon as you pick up the bounty. You can also check with the Gunsmith to see if he's selling any rare fusion rifles to make the process a lot easier. 

When the core is charged, you can swap it for an Unstable Prototype Fusion Rifle Frame. 

Step 4: Kill 200 Enemies in Weekly Nightfall Strike Activities using any Fusion Rifle to Obtain Stabilized Prototype Fusion Rifle 

This step is the most time consuming of the bunch, but it still shouldn't take that long to complete. All the kills you make must by during the weekly Nightfall strike activity using a fusion rifle so you're going to need to get a fireteam together. If at all possible group with players you know so that they know to leave you the low levels enemies like dregs, to kill yourself. 

Step 5: Return the Prototype to the Gunsmith 

With the 200 kills complete you can now return to the gunsmith to collect your prize, the Pocket Infinity Exotic Fusion Rifle!