Custom 300 Blackout 8" Completed Pistol Upper
Custom 300 Blackout 9" Completed Pistol Upper
Custom 300 Blackout 10.5" Pistol Upper With A2 Style Flash Hider
Custom 300 Blackout Completed Upper With 16" barrel, Octocomp Compensator, And M-lok Compatible Handguard
No one needs more than 8"
10.5" may get you some complaints........