My AR-15 uses a Phil Wyld chamber for a caliber .223; a Criterion 20” squad designated barrel; Partially Fluted; 1 in 8 twist; Jewel trigger; with a 1 and1/2 lb. pull; Yankee Hill forged upper receiver and a Yankee Hill full float forearm with Picatinny rail on the end; it has a Troy industries low profile gas bloc; the butt stock is a telescoping Vltor with storage tubes. The sling is “ambidextrous” single point attachment. Mounted on top is a Leupold VX-3, 4×14 Scope w/ varmint reticle. It easily puts 5 rounds of 53gr.Hornady V-Max boat tails under a dime at 100 yds. Using 27 gr. CFE .223 powder.