As with any big bore rifle cartridge recoil is a consideration. The comfort in holding the rifle and the reduced recoil aids accuracy. On firing, both the barrel and barrel extension recoil to the rear. The CZ 75 is a short recoil operated, locked breech pistol. The bolt features a telescoping return spring guide which serves as a pneumatic recoil buffer. The smaller caliber meant that it could be controlled in autofire due the reduced recoil. In a rifle, this will develop well over of free recoil energy. Even the recoil of the .308 Win. It is quite easy to flinch in anticipation of the significant recoil. This "blowback" is the predominant component of the recoil. The M2 fires from a closed bolt, operated on the short recoil principle. The gun and upper carriage recoil together, restrained by the usual hydraulic buffers. The resulting weapon demonstrated good reliability with low recoil and satisfactory accuracy for close-range work. ACP round by lowering the peak force of the recoil pulse. ACP handguns ranked last, largely due to increased recoil.