Definitions by Anonymous
blowback
A method of operation that is used by most automatic firearms. More explicitly, this is the process used to the cycle the breech/bolt assembly (thereby ejecting the spent casing and chambering a fresh round), by either using the recoil force directly caused by the exploding powder charge, or by diverting the expanding gas of the exploding powder charge via a gas tube and piston.
Blow-forward
The opposite of the blowback, the blow-forward method of operation involves a fixed breech/bolt assembly, with the barrel and chamber being the components that are operated by the force of the expanding gas. Though it produces less recoil than a traditional blowback system, it is unnecessarily complex and not as reliable, and therefore, did not catch on in the world of firearms.
Blow-forward by Anonymous August 10, 2003
.45
Generally refers to a very commonplace handgun cartridge first developed for the 1911A1 Colt Autopistol, available in FMJ and JHP. A rather bulky round with a weight of roughly 11 grams, the .45 ACP is seen as the ultimate manstopper by American shooters. Though it is a sub-sonic round that uses relatively low-pressure charge, its sheer size can deliver enough energy to very literally stop a man in his tracks. On the flip side however, it does not have a substantial amount of piercing power. Other .45 cartridges include the .45 LC (for Colt Revolvers), .45 GAP (Glock Auto Pistol), and the .45-60 high-powered revolver load.