Product OverviewMil-Spec SOPMOD ButtStock Combo Product Features ? USA made AR SOPMOD Mil-Spec ButtStock (For most variants) ? LMT platform Mil-Spec buffer tube ? Castle nut and 3oz buffer ? Buffer spring ? Standard steel end plate WarrantyAll JE MACHINE accessories carry a 100% satisfaction guarantee against manufacturer's defects in original materials and workmanship. If your JE MACHINE accessory shows evidence of such defects, JE MACHINE will fix, repair, or replace your accessory at the most cost effective manner possible. JE MACHINE does not warranty products or damage caused to our products as a result of improper installation or incorrect installation of other manufacturers' products. Be sure to keep your sales ticket or receipt as proof of purchase date when making a claim.