So, kid, I heard you want to main HPR, well first you have to pass some simple steps to be able to be an effective HPR Main.
First of is getting your HPR,
The best way is to use the Supply Ordering Console, it is placed next to the req lines and looks something like this.
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In prep, you are going to want to get an M276 Marine pattern ammo load rig and a USCM Satchel
After this head to Req.
You want to order the 'M41AE2 HPR crate (HPR x2, HPR ammo box x2)' Found in the Weapons Section. It will spit out a bit of paper which you want to give it to Req, but there may already be one ordered, so ask Req first.
You should also try to order some extra ammo boxes, they can be found in the Supply Ordering Console, under ammo up the very top called 'M41AE2 HPR Ammo crate (HPR ammo box x2)'
For attachments, you are going to want a Quick Fire Adapter and a Bipod, A suppressor and a recoil compensator is very, very much discouraged.
You will also need a Wrench
This is all you will need from req.
Next head to the cafeteria, you will want to use your wrench to disassemble 5 tables and place them in your satchel, you will use these as portable firing platforms to rest your bipod on.
When in combat place down a table and rest your gun on it, or if you can use cades do. A diagram of how bipods work can be found below.
Blue: The object you are mounting it on, and if you can be in the same square as the object then you can mount your bipod on it.
Green: Where you can mount it and the direction you can mount it in.
You can mount your bipod on many objects such as hydroponics trays if you are in need to deploy your bipod then try anything around you.
When using the HPR you should have it in single fire mode and just click very fast. this will give you more control over your bullets and allow you to keep a more steady stream of fire, the single fire mode really shines when you have the bipod deployed as you can have a seemingly never-ending stream of bullets.
The HPR is a suppressive weapon, you should use it to support your marines and not focus on getting kills, It easily can stop T1's and T2's from pushing out and can scare off T3's by the amount of hellfire going their way.
This is a short guide on how to HPR main in 2018, remember to recycle your tables and never use a fucking recoil comp oh my god.