Daniel Defense Upper Receiver W/Flash Hider Assembly DD5 V4 URG, .308 Winchester, 18In, S2W Profile, Rifle Length, 1-10 Twist, 5/8X24 Thread, M-LOK, Superior Suppression, Nitride, BLK, 23-158-12058

Opticsplanet Exclusive Daniel Defense Upper Receiver, 14.5 In, 1/7 Twist, Mil Spec, Ceracote Finish, Black/Brown, DD-CTM-URG-OP

Daniel Defense Upper Receiver W/Flash Hider Assembly DD5 V5 URG, 6.5Mm, 20in Barrel, S2W Profile, Rifle +1 Length, 1-8 Twist, 5/8X24 Thread, M-LOK, Superior Suppression, Nitride, BLK, 23-165-05209

Daniel Defense MK18, URG, 5.56, 1/7, GOV, LPG, RIS II Rail, DDFS Complete Upper Receiver W/ Flash Hider, Black, 10.3In, 23-004-08013-006

Daniel Defense Complete Upper Receiver W/ Flash Hider, DDM4-V7-LW, 5.56mm NATO, 16 in Barrel, Low Profile, Mid , 1-7 Twist, Free-Floating MFR XS M-LOK Rail, 15 In, Flash Suppressor, 23-128-02932-047

Daniel Defense Upper Receiver With Flash Hider Assembly MK18 RIII URG, 5.56x45mm NATO, 19.3 Inch, 10.3 Inch Barrel, Government Profile, Carbine Length, 1-7 Twist, 1/2X28 Thread, M-LOK Handguard, Flash Suppressor, Salt Bath Nitride, BLK, 23-004-81721-006

Daniel Defense Upper Receiver With Flash Hider Assembly DD4 RIIIS URG, 5.56x45mm NATO, 20.5 Inch, 11.5 Inch Barrel, Government Profile, Carbine Length, 1-7 Twist, 1/2X28 Thread, M-LOK Handguard, Flash Suppressor, Salt Bath Nitride, FDE, 23-191-02397-011

Daniel Defense Upper Receiver W/Flash Hider Assembly DD5 V4 URG, 6.5Mm, 18in Barrel, S2W Profile, Rifle Length, 1-8 Twist, 5/8X24 Thread, M-LOK, Superior Suppression, Nitride, BLK, 23-158-04211

Opticsplanet Exclusive Daniel Defense Custom A4 Upper Receiver Group, 14.5 In, GV MID Daniel Defense Extended Flash Suppressor, MFR 13.5 Mil Spec, Black/Brown, DD-CTM-URG-OP2

Daniel Defense Upper Receiver With Flash Hider Assembly DD4 RIII URG, 5.56x45mm NATO, 25 Inch, 16 Inch Barrel, Government Profile, Mid Length, 1-7 Twist, 1/2X28 Thread, M-LOK Handguard, Flash Suppressor, Salt Bath Nitride, BLK, 23-191-20088-006

Daniel Defense Big Hole Upper Receiver W/ Feed Ramps, 04-012-09001

DEMO, Daniel Defense M4A1 14.5 in Barrel 5.56mm NATO Upper Receiver Group

Daniel Defense DDM4V7 S, URG, 5.56, 1/7, GOV, LPG, MFR XS Rail 10.0, DDFS Complete Upper Receiver W/ Flash Hider, Black, 11.5In, 23-128-00275-047

Daniel Defense DDM4 300 S, URG, 300 AAC Blackout, 1/8, S2W, LPG, DDM4 Rail 9.0, DDFS Complete Upper Receiver W/ Flash Hider, Black, 10.3In, 23-088-19020-047

Daniel Defense Upper Receiver With Flash Hider Assembly M4A1 RIII URG, 5.56x45mm NATO, 25 Inch, 14.5 Inch Barrel, M4 Profile, Mid Length, 1-7 Twist, 1/2X28 Thread, M-LOK Handguard, Flash Suppressor, Salt Bath Nitride, FDE, 23-004-01097-011

Daniel Defense Upper Receiver With Flash Hider Assembly M4A1 RIII URG, 5.56x45mm NATO, 25 Inch, 14.5 Inch Barrel, M4 Profile, Mid Length, 1-7 Twist, 1/2X28 Thread, M-LOK Handguard, Flash Suppressor, Salt Bath Nitride, BLK, 23-004-01097-006

Daniel Defense MK12 Upper Receiver Group 5.56mm NATO 18 Inch MK12 Profile Barrel With Salt Bath Nitride Finish

DEMO, Daniel Defense Upper Receiver With Flash Hider Assembly DD4 RIII URG, 5.56x45mm NATO, 25 Inch, 16 Inch Barrel, Government Profile, Mid-Length, 1-7 Twist, 1/2X28 Thread, M-LOK Handguard, Flash Suppressor, Salt Bath Nitride, FDE, 23-191-20088-011

Daniel Defense Aimpoint Low-Profile Micro Mount For Flat Top Upper Receiver, Black, 03-045-18025

Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56Mm, 16 Inch Barrel, Mid-Length Profile, 1-9 Twist, 1/2-28 Thread, A2 Flash Hider, Black, AR0375B

POF USA Renegade Plus Upper Receiver Assembly, 5.56Mm, 16.5in Barrel, M-LOK Rail, Burnt Bronze, 1325

Rock River Arms Completed Upper Receiver, Varmint A4, .308/7.62x51mm NATO, 20 Inch Barrel, 1-10 Twist, Free-Float Handguard, Black, 308A0551

Rock River Arms Upper Receiver, EOP .223 Wylde, 18 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0530

Rock River Arms Completed Upper Receiver, A4, .450 Bushmaster, 20 Inch Barrel, 1-24 Twist, 5/8-32 Thread ,Free-Float Handguard, Brake, Black, 450B0587

Rock River Arms BT-3 Completed Upper Receiver, 6.5mm Creedmoor, 32In, 24in Barrel, Standard SS Fluted Profile, 1-10 Twist, 5/8X24 Thread, M-LOK Handguard, Operator Brake, Black, 65C0577BT

Rock River Arms Upper Receiver, A4 .223 Wylde, 20 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0550

Daniel Defense AR Rifle Rear Reciever QD Attachment Point W/Swivel, Black, DD03-018-30026

Stag Arms AR-15 Tactical Upper Receiver, 5.56x45mm NATO, 7.5in Barrel, GOV-CMV Profile, 1-7 Twist, 1/2X28, Left Hand, VG6 Delta, Chromephos, FDE, STAG15111921