JeffG
Member
Squirt of brake parts cleaner, muzzle down. Clean bore with Hoppe's or CLP.
"/QUOTE]"If you don't clean your weapon the problem is self-correcting./QUOTE]
why would you guess something like that? there are half a dozen common sense indications just off the top of my head that it couldn't possibly be that wayNo real reason to clean a gas tube considering the 5.56 is a 50,000-60,000 psi pressure cartridge. I'm guessing that by the time the bullet makes its way down to the gas port, there is still 50,000+ psi of gas pressure running up the tube and one would think that would be enough to blow anything out!
When we built CAR's for the Recon detachment of the 7th, we hadn't figured that out yet, and cutting the issue M16A1 gas tubes down resulted in severe overgassing, so we carefully bent full-length gas tubes like pigtails to fit under the handguards of the CAR forends. It was a PITA, but it worked.The gas port size in the barrel is one of the best ways to control bolt velocity during cycling. But since this is hard for the end user to do adjustable gas blocks are the next best thing.
Saw some of those recently as a new manufactured item for AR's on some website looking for something else. Interesting to know that they actually worked.When we built CAR's for the Recon detachment of the 7th, we hadn't figured that out yet, and cutting the issue M16A1 gas tubes down resulted in severe overgassing, so we carefully bent full-length gas tubes like pigtails to fit under the handguards of the CAR forends. It was a PITA, but it worked.
Negative, Ghost Rider. The velocity of the gas would have to be supersonic to create a shockwave. When a supersonic fluid passes through an orifice, its velocity drops to the speed of sound. Therefore, the velocity of the gas entering the gas tube is not supersonic....The gas tube itself ends up choking flow due to shock-wave propagation reflecting off the gas key...
And they rarely get used, except maybe in Basic. I had some in my Armorer's kit, for display purposes. Used exactly one, to test the gas tube on my A1 right before I brought it to the shop to change the barrel after burning up thousands of M200 blanks after an FTX- yeah, it came out black, but the tube was wide open, no restriction. I had heated the barrel cherry-red to the point my roommate lit his cigarette off it.and the US Army that uses a lot more AR15s than anyone on here stocks and supplies to unit armorers long pipe cleaners specifically for cleaning those tubes
Negative, Ghost Rider. The velocity of the gas would have to be supersonic to create a shockwave. When a supersonic fluid passes through an orifice, its velocity drops to the speed of sound. Therefore, the velocity of the gas entering the gas tube is not supersonic.