This Diamondback DB15-YB upper chambered in 5.56x45 NATO with a Sightmark Reflex Sight would help make a pretty good little AR-15 to have fun at the range, use for home defense, or to use as a truck gun. This upper has had around 250 rounds run through it while plinking at the range, and doesn't have any damages or issues... For reference, the basic version Diamondback DB15-YB current MSRP is $730 (before taxes, registration, and shipping) from factory with no sights at all.

1. Diamondback DB15-YB upper receiver group, which has a medium-weight 16" midlength gas system nitride barrel with 1:8 twist, and a 15" MLOK handguard.
2. Sightmark Sure Shot Reflex Sight, w/ four (4) selectable multiple reticles, selectable intensity red illumination, and CR3032 battery.
3. Toolcraft nitride 9310 bolt-carrier group.
4. Strike Industries 7075-T6 aluminum ARCH charging handle.

For $150 extra (usually they're $180ish) I will sell the Vortex Strikefire II red dot sight with it that I have on hand, along with its lower 1/3 cowitness and low M1913 Picatinny mounts.

For $50 extra (usually between $90 to $110) I will sell the Forward Controls 1215KM suppressor mountable single-chamber muzzle brake.