I have a DPMS AR-15 Flat-Top Upper Assembly 223 Remington 1 in 8" Twist 20" Bull Barrel Stainless Steel with Free Float Handguard, topped with millet rings and a Millett Tactical TRS-1 Rifle Scope 30mm Tube 4-16x 50mm Side Focus 1/10 Mil Adjustments Green Illuminated Mil-DotBar Reticle Matte. There is also a 4" rail added to the bottom of the free float tube for a bipod. This upper is literraly a tack driver out to 200 yard. I've had 5 shot .25" groups at a 100yds. Scope also adjust true. Gun and scope have shot 2" steel swingers out to 500 meters with ease. Gun has been properly broke in. Round count is 301, no damage, and has functioned flawlessly. $800.00.