Editing Chassis (section)

===Firearms===
{{See also|Rifle bedding}}
[[File:XM2010 November 2010.jpg|thumb|The [[M2010 Enhanced Sniper Rifle]], based on the [[bolt-action]] [[Remington 700]] design but [[rifle bedding|bedded]] inside an [[accurizing]] chassis.]]

In firearms, the chassis is a [[rifle bedding|bedding]] frame on [[long gun]]s such as [[rifle]]s to replace the traditionally wooden [[Stock (firearms)|stock]], for the purpose of better [[accurizing]] the gun. The chassis is usually made from hard [[metal]]lic material such as [[aluminium alloy]] (and less frequently [[stainless steel]], [[titanium alloy]] or recently [[magnesium alloy]]) due to metals having superior [[stiffness]] and [[compressive strength]] compared with wood or synthetic [[polymer]], which are commonly used in conventional [[rifle]] stocks.

The chassis essentially functions as a more extensive pillar bedding, providing a metal-on-metal [[bearing surface]] that has reduced shifting potential under the stress of [[recoil]]. A [[gun barrel|barrel]]ed [[action (firearms)|action]] bedded into a metal chassis would theoretically operate more consistently during repeated firing, resulting in better [[accuracy and precision|precision]]. With the increasing availability of [[CNC machining]], chassis have become more affordable and sophisticated as well as gained increasing popularity as these types of chassis can be expanded to accommodate customizable "furniture" ([[buttstock]], [[pistol grip]], etc.) and [[rail interface system]]s that provide mounting points for various accessories.