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An indirect gas operating system for an M4 type automatic or semi-automatic firearm. The indirect gas operating system has a gas block having a cylinder. The gas block is fitted to a barrel assembly having a bore with the cylinder in communication with the bore. A piston having a piston end and a st

An indirect gas operating system for an M4 type automatic or semi-automatic firearm. The indirect gas operating system has a gas block having a cylinder. The gas block is fitted to a barrel assembly having a bore with the cylinder in communication with the bore. A piston having a piston end and a striking end has the piston end fitted to the cylinder. A bolt assembly having a striking surface is provided. When a cartridge is fired, gas displaces the piston end and causes the striking end to strike the striking surface displacing the bolt assembly. The cylinder and the piston are together removable as an assembly from the firearm without removal of the gas block.

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What is claimed is: 1. An indirect gas operating system for an automatic or semi-automatic firearm, the indirect gas operating system comprising: a gas block having a cylinder, the gas block fitted to a barrel assembly having a bore, the cylinder in communication with the bore; a piston having a pi

What is claimed is: 1. An indirect gas operating system for an automatic or semi-automatic firearm, the indirect gas operating system comprising: a gas block having a cylinder, the gas block fitted to a barrel assembly having a bore, the cylinder in communication with the bore; a piston having a piston end and a striking end, the piston end fitted to the cylinder; and a bolt assembly having a striking surface; wherein, when a cartridge is fired, gas displaces the piston end and causes the striking end to strike the striking surface displacing the bolt assembly, and wherein, the cylinder and the piston are together removable as an assembly from the firearm without removal of the gas block from the firearm. 2. The indirect gas operating system of claim 1, wherein the cylinder is coupled to the gas block with a removable pin, wherein the pin provides a caroming surface to seal the cylinder to a gas port in the gas block. 3. The indirect gas operating system of claim 1, wherein the piston comprises slots, the slots adapted to remove carbon build up during operation. 4. The indirect gas operating system of claim 1, wherein the cylinder further comprises an index pin, and wherein the gas block further comprises a camming feature, and wherein the cylinder is rotatably positioned in the gas block with the index pin engaging the camming feature, and wherein the camming feature provides a camming surface to extract the assembly from the gas block. 5. The indirect gas operating system of claim 1, wherein the automatic or semi-automatic firearm is an M-4 type Firearm. 6. The indirect gas operating system of claim 1, wherein the piston comprises rings, the rings adapted to remove carbon build up during operation. 7. The indirect gas operating system of claim 1, wherein the striking end comprises an operating rod. 8. A semi-automatic or automatic rifle comprising: a receiver having an integral hand guard portion; a barrel having a bore, the bore removably connected to the receiver, the hand guard portion extending over and surrounding the barrel; an indirect gas operating system having a gas block and a piston; the gas block having a cylinder, the gas block fitted to the barrel, the cylinder in communication with the bore; a piston having a piston end and a striking end, the piston end fitted to the cylinder; and a bolt carrier having a striking surface; wherein, when a cartridge is fired, gas displaces the piston end and causes the striking end to strike the striking surface displacing the bolt assembly, and wherein, the cylinder and the piston are together removable as an assembly from the firearm without removal of the gas block. 9. The semi-automatic or automatic rifle of claim 8 further comprising a removable accessory device mounting rail removably connected to the receiver and having another hand guard portion mateable with the integral hand guard portion of the receiver. 10. The semi-automatic or automatic rifle of claim 8, wherein the cylinder is coupled to the gas block with a removable pin, wherein the pin provides a camming surface to seal the cylinder to a gas port in the gas block. 11. The semi-automatic or automatic rifle of claim 8, wherein the cylinder further comprises an index pin, and wherein the gas block further comprises a camming feature, and wherein the cylinder is rotatably positioned in gas block with the index pin engaging the camming feature, and wherein the camming feature provides a camming surface to extract the assembly from the gas block. 12. The semi-automatic or automatic rifle of claim 8, wherein the rifle is an M-4 type firearm. 13. The semi-automatic or automatic rifle of claim 8, wherein the striking end comprises an operating rod.