Standard

Battle Arms Development WORKHORSE, Complete Upper Receiver, 5.56 NATO, 16" Barrel, Fits AR-15, M-Lok Handguard, Anodized Finish, Black, Includes Bad Rack-15 C Ambidextrous Charging Handle and AR15/M16 BCG WH-UR16B-Y-15C

Ballistic Advantage Upper Receiver, Fits AR15 Rifles, Anodized Finish, Black BAPA100049

Ballistic Advantage Upper Receiver, Fits AR15 Rifles, Anodized Finish, Black BAPA100084

Ballistic Advantage BA10, Upper Receiver, Fits AR10 Rifles, Anodized Finish, Black BAPA100091

Bravo Company Upper, Mil-Spec, 1913 Rail for Mounting Optics and Accessories, Flat Top, Black BCM4-UR-M4

Bootleg Billet Upper, Upper, Black, AR15 BP-UR-1A

Black Rain Ordnance Milled Upper Receiver, 223 Remington/5.56 NATO, Flat Top Sights, Black Finish BRO-MUR-2

Black Rain Ordnance 458 SOCOM Complete Upper, 16" 4150 Chrom-Moly Vanadium Steel Barrel, 1:14 Twist, Forged, 15" MLOK Rail, Nitride Coated BCG, Billet Charging Handle w/Extended Tac Latch, 458 SOCOM Muzzle Brake, Black Finish BRO-SPEC15-CU-458S

Chiappa Firearms M4-22 Gen II Pro, Conversion Kit, Upper Receiver, 22LR, 16" Heavy Barrel, 11.8" Forend, 8 Position Picatinny Rail, 2 Magazines, Black, 10Rd 500.096

CMMG Conversion Kit, Bravo, Fits AR Rifles, 22LR, 10Rd 22BA62F

CMMG AR Conversion Kit, 22LR, Stainless Steel Bolt Group, 3 Magazines, 10Rd 22BA6AE

CMMG Resolute MK4, Upper Receiver, 350 Legend, 16.1" Barrel, Cerakote Finish, Armor Black 35B5FBC-AB

CMMG Resolute MK4, Upper Receiver, 6MM ARC, 16.1" Barrel, Cerakote Finish, Armor Black 60B1091-AB

Colt's Manufacturing Upper, 223 Remington/5.56 NATO, Black Finish, Dust Cover, Forward Assist, M4 Feed Ramps SP63528

Daniel Defense M4A1, Upper, Complete Upper Receiver, 5.56 NATO, 14.5" Pinned (16" OAL), Daniel Defense M4A1 FSP Rail Interface System Rail, Carbine-Length Gas System, Surefire SF3P Flash Hider, M16 Profile Bolt Carrier Group, Anodized Finish, Flat Dark Earth and Black 23-004-09376

Daniel Defense M4A1 Upper Receiver, 223 Remington/5.56 NATO, 14.5" Barrel (16" OAL with Pinned Brake), Carbine-Length Gas System, 1:7 Twist, M4 12.0 Rail, Flat Dark Earth Finish, Fits AR-15 23-004-13150

Daniel Defense DDM4V7, Complete Upper, 223 Remington/5.56 NATO, 16" Cold Hammer Forged Barrel, 1:7 Twist, Black, M-LOK 23-128-02339-047

Daniel Defense DDM4V7 Lightweight, Complete Upper, 223 Remington/5.56 NATO, 16" Lightweight Barrel, 1:7 Twist, Black Finish, M-LOK 23-128-02932-047

FN America SCAR Light Non-Reciprocating Charging Handle, Conversion Kit, Fits FN SCAR Heavy (17S/20S), Black, Includes NRCH Bolt Carrier, Charging Handle Sled and (2) Ambidextrous Charging Handles 20-100505

Fortis Manufacturing, Inc. Billet M4 Upper, Stripped, Fits AR15, 223 Remington/5.56 NATO, Black Color, Anodized Finish U-Billet-M4

Faxon Firearms ION Ultralight, Complete Upper Receiver, Gas Operated, 5.56 NATO, 16" Pencil Barrel, Integral 3-Port Brake, Multi-Position Adjustable Gas Block, Fits AR-15, 13" M-LOK Handguard, Matte Finish, Black, Includes Gunner Lightweight Bolt Carrier Group, Enhanced Ambidextrous Charging Handle FX5500-U

Geissele Automatics URG-I, Near Clone, Complete Upper Receiver, 5.56 NATO, 14.5" (16" OAL) Barrel, 1:7 Twist, Pinned and Welded Surefire 4 Prong Flash Hider, Desert Dirt Color 13.5" SMR MK16 M-LOK Free Float Handguard, Desert Dirt Color Geissele Airborne Charging Handle, Geissele Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Black, Includes Super 42 Braided Wire Buffer Spring and H1 Buffer 08-159

Geissele Automatics Super Duty MOD1, Complete Upper Receiver, 5.56 NATO, 13.9" Pinned (16" OAL) Barrel, M-LOK Free Float Handguard, Geissele Airborne Charging Handle, Nanoweapon Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Black 08-546B

Geissele Automatics Super Duty MOD1, Complete Upper Receiver, 5.56 NATO, 13.9" Pinned (16" OAL) Barrel, M-LOK Free Float Handguard, Geissele Airborne Charging Handle, Nanoweapon Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Desert Dirt Color 08-546S