End Cap
The front cap of a suppressor, carrying the bore hole through which the bullet exits, whose alignment is critical to safety and accuracy.
The end cap closes the front of a silencer and contains the final bore opening that the bullet passes through on its way out. Because it is the last point of contact for the gas column and the closest hole to the muzzle of the can, its concentricity with the bore matters as much as that of any internal baffle. A cap that is even slightly off-center narrows the clearance the bullet has on exit.
If the end-cap hole drifts out of alignment, the projectile can clip metal on the way out, which is a form of baffle strike and can wreck the suppressor or damage the muzzle of the host rifle. For that reason end caps are machined to tight tolerances, and many shooters verify alignment with a bullet or alignment rod before live fire on a newly mounted can.