When it comes to firearms, consumers often wonder about military-grade and commercial-accessible parts. Both mil-spec and commercial buttstocks are widely available, but minor differences may hinder a firearm enthusiast’s satisfaction.

Understanding key differences is important, chiefly for collection purposes, as commercial and mil-spec buttstocks are very similar.
 

Size

Commercial and mil-spec receiver extensions differentiate in size. A completely mil-spec firearm tube is created from 7075-T6 alloy, which provides 1-3 and 16-16 UN thread rolls.

Commercial-spec additions were created to reduce the firearm owner’s overall costs, as the extension is manufactured from an extruded tube. The tube features a welded-on cap, nor