These are the weapon builds I use for Falllout 4. They get fast kills on very hard and are fun to use.
I have high carry capacity, and have lots of points in weapon skills and bullet looting.
Some guns are tuned down because certain prefixes like Quick, Advanced, Reflex, Short and Light boost AP use.
Muzzles are often tuned to benefit a certain range.
0 -Light Rifle (Pipe Pistol)
.45 Receiver
Long Finned Barrel
Recoil Compensating Stock
Large Quick Eject Mag
Short Scope
Suppressor
1 - Light Pistol (Pipe Pistol)
Powerful Automatic Receiver
Short Light Barrel
Sharpshooter's Grip
Quick Eject Drum Mag
Glow Sights
Muzzle Brake
2 - AP Auto Shotgun
Hardened Piercing Auto Receiver
Long Ported and Shielded Barrel
Recoil Compensating Stock
Medium Quick Eject Mag
Front Sight Ring
Compensator
-Good against Mirelurks or against anything.
2 - Powerful Shotgun
Advanced Receiver
Short Ported and Shielded Barrel
Recoil Compensating Stock
Quick Eject Drum Mag
Front Sight Ring
Muzzle Brake
-Good against Ghouls.
3 - Sword (General Chao's Revenge from Trudy in Drumlin Diner)
Electrified Serrated Blade
-I bought the weapon mod from a vendor and didn't purchase the Blacksmith perk.
4 - AP Auto Pistol (10mm Pistol)
Hardened Piercing Auto Receiver
Long Light Ported Barrel
Sharpshooter's Grip
Large Quick Eject Mag
Glow Sights
Compensator
-Decent damage against anything. Great against turrets.
5 - Deliverer
Advanced Receiver
Short Barrel
Sharpshooter's Grip
Large Quick Eject Mag
Glow Sights
Suppressor
-The Short Barrel rather than the Long Barrel really boosts its AP use.
6 - AP Assault Rifle (Overseer's Guardian from Alexis Combes in Vault 81)
Hardened Piercing Auto receiver
Long Light Barrel
Recoil Compensating Stock
Large Quick Eject Mag
Front Sight Ring
No Muzzle
-Great against Super Mutants. Easy to use to near-long range by looking down the iron.
7 - Scout Rifle (Hunting Rifle)
Calibrated Powerful Receiver
Long Light Barrel
Marksman's Stock
Medium Quick Eject Mag
Medium Scope
No Muzzle
7 - Laser Sniper (Old Faithful from Arturo Rodriguez in Diamond City)
Overcharged Capacitor
Improved Sniper Barrel
Recoil Compensating Stock
Short Night Vision Scope
Fine-tuned Beam Focuser
7 - Sniper Rifle (Hunting Rifle)
.50 Receiver
Long Ported Barrel
Marksman's Stock
Large Quick Eject Mag
Long Night Vision Scope
Suppressor
8 - Kellog's Pistol
Advanced Receiver
Bull Barrel
Comfort Grip
Reflex Sight
9 - Auto Laser Rifle (Righteous Authority)
Boosted Gamma Wave Emitter
Improved Automatic Barrel
Recoil Compensating Stock
Reflex Sight
Quantum Gyro Compensating Lens
-Good against Synths, or against anything
/ - Rocket Launcher (Partystarter from KL-E-0 in Goodneighbor)
Triple Barrel
Standard Sights
Stabilizer
-Unreal Tournament style rocket launcher. The Quad Barrel blocks vision.