These top ends were designed and tested using a MIL-SPEC lower receiver with our 9mm Magazine Adapter and a Standard Hammer. Due to differences between manufacturers, we cannot guarantee they will work on every lower receiver. Features Include: MilSpec Forged 7075-T6 Aluminum YHM Flat Top Upper Receiver; "T" Marked Upper Receiver; Forward Assist Installed; CMMG Ramped 9mm Bolt Carrier Assembly; 16" 4140 Steel Barrel, Heat Treated to RC 25-32, Threaded 1/2"-36; Chambered in 9X19mm, with a 1:14", 6 groove Twist; YHM Diamond Fluting Improves Rigidity and Aids in Barrel Cooling; YHM 9mm 5C2 Flash Hider / Compensator; YHM Specter Length Diamond Handguard; YHM Forearm Endcap; YHM Forearm Mounted Flip Front Sight; YHM Flip Rear Sight
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I had to purchase this w/o the 32 rd magazine , the magwell block, buffer and 10 rd magazines separate as I live in Kalifornia. I am still glad I purchased this product as all my reloads function through this upper without even a hiccup. Appears to be a high quality upper and I expect some great groups as soon as I get to the range where I can put them on paper.