Nemo Arms Large Frame Recoil Reduction Kit, Bolt Carrier Group and Buffer Kit, Fits Most AR-308 Large Frame Receivers, Includes BCG, Buffer, Buffer Tube, Buffer Retainer and Spring, and Buffer Spring,

Luth-AR Fixed Rifle Length Buffer Tube Complete Assembly Fits AR-10 Rifles, with Buffer, Buffer Tube, & Spring, Black BAP-308

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Spikes Tactical Rifle Buffer Tube Assembly, Includes Buffer, Buffer Tube, Buffer Spring, Castle Nut, End Plate, Fits AR-15 Rifles, Black SLA500R-K

San Tan Tactical Buffer Tube Kit STT-Buffer Tube Kit, Black STT-Buffer Tube Kit