5.56x45mm NATO Barrels

16" Billet Slick Side 5.56 Parkerized Mid-Length 1:7 M-LOK AR-15 Complete Upper

16" Billet Slick Side 5.56 Parkerized Mid-Length 1:7 M-LOK AR-15 Complete Upper

Ballistic Advantage 14.5" 5.56 M4 Profile Carbine AR-15 Barrel, w/ FSB, Circular Cap and Delta Ring Assembly

BRD 16" 5.56 NATO 1:7 Twist HBAR Fluted Mid-Length Stainless Steel Barrel

7.5" 5.56 NATO QpQ Nitride 1:7 Twist Barrel

16" Carbine 5.56 NATO 1:7 Complete Upper

7.5" 5.56 NATO 1:7 Parkerized Pistol Length Barrel

16" 5.56 NATO 1:7 Twist Black Nitride Mid-Length Barrel

Faxon Firearms Ascent 10.5" 5.56 Barrel Upper Receiver

Ballistic Advantage 14.5" 5.56 Government Profile Midlength AR-15 Barrel, Modern Series w/ FSB, Circular Handguard Cap and Delta Ring Assembly

16" Billet Slick Side 5.56 Parkerized Mid-Length 1:7 M-LOK AR-15 Complete Upper

16" 5.56 NATO 1:7 Twist Mid-Length Parkerized Barrel

14.5" 5.56 NATO Mid-Length AR 15 Barrel

16" 5.56 Parkerized 1:7 Carbine Length Barrel

5" 5.56 NATO 1:5 Micro Black Nitride Barrel

7.5" Stealth 5.56 NATO AR 15 Pistol Upper

FN America SCAR 16S 14" Barrel Assembly 223Rem/556NATO

Midwest Industries 10.5" AR 15 Pistol Upper

Diamondback Firearms 16" 5.56 NATO Medium Profile Barrel

Battle Arms Workhorse 16" 5.56 NATO Upper Assembly (No BCG No CH)

Diamondback Firearms Medium Profile 5.56 NATO 10" AR 15 Barrel

Diamondback Firearms M4 16" 5.56 NATO AR 15 Barrel

Radical Firearms 16" 5.56 NATO SOCOM Profile AR 15 Barrel

16" 5.56 NATO Mid-Length AR 15 Barrel