The Dirty Bird 14.5" Midlength Magpul MOE SL complete upper is a great starting point for your next build. It features a 14.5" barrel chambered in 5.56 NATO that has been pinned and welded with an extended flash hider to reach an overall barrel length of 16". It features a pinned front sight gas block and midlength gas system along with a Magpul MOE SL M-LOK handguard. The upper receiver is forged from aluminum to Mil-Spec dimensions and hardcoat anodized black.Features: 14.5" barrel chambered in 5.56 NATO that has been pinned and welded with an extended flash hider to reach 16". Black Nitride Barrel Finish Pinned front sight gas block Midlength gas system High Pressure Tested and Magnetic Particle Inspected Magpul MOE SL M-LOK handguard Extended A2 flash hider Flat Top M4 upper receiver Forged aluminum to Mil-Spec SUB-MOA Guarantee**Includes BCG and Charging HandleMade in the USA - Backed by Dirty Bird Industries' Limited Lifetime Warranty