The Evolution HD rifle chassis is designed as a premium platform for aftermarket large diameter receivers. While it is modeled from our original Evolution chassis it is basically a beefed up version specifically for larger actions commonly used with the 338 LM and Chey-Tac sized cartridges. The chassis features a 2" inch centered handguard 16" in length. This chassis is fully adjustable to ensure perfect union between you and your rifle. This chassis is generally used with actions of 1.45” diameter or larger.