Yes sir, this is a mil-spec buffer tube.
Stay safe & have a great day!

Hi and welcome. Yes Sir, this model has a Mil-Spec Buffer Tube. Cheers, stay safe and enjoy!

yes it is see ******
Product Details
Features
Barrel: Chrome Moly steel. Chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a carbine-length gas system. Barrel is finished off with a classic handguard, F-Marked gas sight base, and A2 flash hider.
Upper: Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. Uppers include forward assist and dust cover. These uppers are made for us right here in the USA by a mil-spec manufacturer. Detachable A2 carry handle is included.
Bolt: Full-auto profile bolt carrier group. Shot-peened, mil-spec Carpenter No. 158® steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec.
Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked "MULTI" for caliber. Finish is hard coat anodized. Finished with a DPMS CAR Style Blade Brace and *****6 position mil-spec buffer tube. The fire control group is a DPMS single-stage mil-spec assembly. https://dpmsinc.com/dpms-dp-15-10-5-5-56-nato-1-7-nitride-classic-pistol-w-a2-carry-handle-black.html