DT SRS Bolt Assembly come in three sizes. There have horazontal lines cut into the smaller bolt lug nearest to the bolt handle. One line is compatible with .308 Win and 6.5 Creedmoor conversion kits. Two lines means it is compatable with .300 Win Mag and .300 RUM. Three lines means it is compatable with the .338 Lapua Mag. The SRS Bolt Assemblies will work in both the SRS-A2 and SRS-A2 Covert chassis as well as the older revisions of both chassis. That includes the SRS-A1, SRS Gen-2, and the SRS Gen-1.

The DT HTI Bolt Assembly use the same marking system as the SRS-A2 Bolt Assemblies. One Line is compatible with .375 and .408 Cheytac. The other HTI Bolt has two lines which means it is compatible with the .416 Barrett and .50 BMG. The HTI Bolt Assemblies will only work in an HTI chassis

The SRS bolt assemblies featuring fluted body for reduced weight and smoother function. Compatible with SRS and SRS Covert chassis.

These bolts can also be use for custom barrels and calibers as long as the caliber uses the same bolt face. For more details contact Special Purpose Rifles.