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Hi Jerek, Del-Ton also uses a Mil-Spec Buffer Tube. Stay safe & have a great day!

mil spec see ****** Del-Ton Inc. Echo 316L Optics Ready Specifications and Features: Del-Ton Item Number: ORFTLW16-0 AR-15 Semi Automatic Rifle Lightweight Optics Ready Carbine 5.56 NATO (also accepts .223 Remington) 30 Rounds 16" Lightweight Profile Barrel with M4 Feed Ramps 1:9 Twist with Threaded Muzzle and A2 Flash Hider Manganese Phosphated Barrel Finish Carbine Length Gas System Forged 7075 T6 Aluminum Receivers Flat Top Upper with White T-Marks Phosphated 8620 Steel Carrier Assembly Mil-Spec Chrome Lined Carrier with Carpenter 158 Steel Bolt Chrome Lined Properly Staked and Sealed Gas Key with Grade 8 Screws Carbine Length Polymer Handguard *******Mil-Spec Sized Buffer Tube Mil-Spec M4 Collapsible Stock Black Hard Coat Anodized Finish Overall Length: 32.625" to 36.375" Weight 5 lbs 7 oz Made In The USA

Hi Jerek and welcome back. Mil-Spec buffer tube assembly. Cheers and stay safe!