tirod
01-18-11, 08:44
What is it, about 9 million M16/M4/AR15's built since the early '60s?
They are all piston guns, each and every one except the pistol caliber blowback versions. Direct Impingement may conjure up visions of some space gun action, it's actually a simple adaptation of the traditional gas action using a piston and cylinder.
Right? OK, pickup the carbine/rifle, shotgun it, pull out the BCG, remove cotter pin, firing pin, and cam pin, separate bolt from carrier.
Look at the bolt tail. Look at the gas rings. That's the piston head end. Look in the carrier. That's the gas cylinder. Gas comes in via the gas key, pressurizes the cylinder. The gas rings keep it from leaking out so it can do work. What it does is move the cylinder, not the piston - no law of mechanics broken there, either can move. As the carrier moves to the rear, the cam pin rotates the bolt unlocked, the upper channel keeps the bolt unlocked, and the BCG cycles the action.
It's a piston gun that has gas pressure directly impinging the bolt carrier to make the action cycle.
No specific agenda here, most just don't see it. If a piston gun is wanted, go for it. The expressed intent of many piston gun owners is to not have to clean it as much, fine. Don't clean the DI either, all the better grade guns keep on shooting anyway. Saying the DI is dirtier than Piston, no. Go look at either piston face after five magazines, they are both dirty. Saying the piston gun is cooler, no, get an IR thermometer gun and read the temps - piston guns at the cylinder on the barrel are much hotter than DI guns are in the carrier. Can you hold the Piston gun cylinder in your hand after a full mag dump? The DI carrier can be.
Where you choose to put the piston is your business, let's just keep an even playing field about it. Compare apples to apples, piston to piston, cylinder to cylinder, not op rod operated bolt carrier to DI bolt carrier. It's not just a DI carrier, it's the cylinder and piston, too.
Ok, piston back in cylinder, cam pin in, firing pin in, cotter pin in, unlock the bolt and insert into upper, close and push the pins in. Don't forget to be safe with your piston gun.
They are all piston guns, each and every one except the pistol caliber blowback versions. Direct Impingement may conjure up visions of some space gun action, it's actually a simple adaptation of the traditional gas action using a piston and cylinder.
Right? OK, pickup the carbine/rifle, shotgun it, pull out the BCG, remove cotter pin, firing pin, and cam pin, separate bolt from carrier.
Look at the bolt tail. Look at the gas rings. That's the piston head end. Look in the carrier. That's the gas cylinder. Gas comes in via the gas key, pressurizes the cylinder. The gas rings keep it from leaking out so it can do work. What it does is move the cylinder, not the piston - no law of mechanics broken there, either can move. As the carrier moves to the rear, the cam pin rotates the bolt unlocked, the upper channel keeps the bolt unlocked, and the BCG cycles the action.
It's a piston gun that has gas pressure directly impinging the bolt carrier to make the action cycle.
No specific agenda here, most just don't see it. If a piston gun is wanted, go for it. The expressed intent of many piston gun owners is to not have to clean it as much, fine. Don't clean the DI either, all the better grade guns keep on shooting anyway. Saying the DI is dirtier than Piston, no. Go look at either piston face after five magazines, they are both dirty. Saying the piston gun is cooler, no, get an IR thermometer gun and read the temps - piston guns at the cylinder on the barrel are much hotter than DI guns are in the carrier. Can you hold the Piston gun cylinder in your hand after a full mag dump? The DI carrier can be.
Where you choose to put the piston is your business, let's just keep an even playing field about it. Compare apples to apples, piston to piston, cylinder to cylinder, not op rod operated bolt carrier to DI bolt carrier. It's not just a DI carrier, it's the cylinder and piston, too.
Ok, piston back in cylinder, cam pin in, firing pin in, cotter pin in, unlock the bolt and insert into upper, close and push the pins in. Don't forget to be safe with your piston gun.