hey both operate basically the same (to my understanding). is there an advantage of one over the other?
2007-10-11 09:27:39 · 7 answers · asked by Anonymous in Sports ➔ Outdoor Recreation ➔ Hunting
Gas operated channels some of the propellant gasses back to unlock the bolt and cycle the action. This requires a less powerful action spring, causes less wear and tear on the action, and generally lasts longer in a high power system. The blowback design necessitates a heavier recoil spring and a much heavier receiver. That is why there are so very few blowback centerfire rifles ever made.
2007-10-11 10:06:49 · answer #1 · answered by boruma35 3 · 2⤊ 0⤋
Blowback is limited to small calibers because of its design. In larger calibers, the bolt recoils rearward at too high of velocity and wears the gun out very fast. The way to prevent this is increase the weight of the bolt. You will see very few rifles outside of 22 rifles that are blowback. The 1919a4 is one, but of the pieces that "blow back" you have a barrel, barrel extension, and bolt with a combined weight of nearly 15 pounds. For anything other a semi-mobile crew served gun, the weight would be prohibitive.
This is why most rifles larger than 22's are "gas operated". I prefer rifless that use a piston in a gas cylinder as that they are generally cleaner and more reliable than gas impingement. The gas impingement ones just use a section of steel tube to tap gas off the barrel directly against the bolt. These have a tendancy to crude up the bolt. I have a MAS 49/56 that is gas impingement and it always gets the corrosive salts in the bolt and that darn tube and are nasty to clean. I can't really get anything in the steel tube to clean it, other than a pipe cleaner. Its inside diameter is only like 1/16 of an inch. As for gas operated, my SKS has a large gas tube of nearly 1/2 inch inside diameter, and is very easy to clean.
2007-10-11 19:59:02 · answer #2 · answered by Matt M 5 · 1⤊ 0⤋
Gas Operation vs. Piston Operation vs Blow Back or Recoil Operation
Gas operation is dirty and fouls up quick causing jamming but on the other hand only requires a quick wipe down to solve.
Piston operation has a operating rod which in a fire fight sometimes has some heating issues and may bend cause the rifle to be unusable.
Blow/Recoil operation is simple but accuracy sucks and larger calibers say anything bigger then pistol rounds is hard to control.
None of the three are a like.
2007-10-11 19:49:15 · answer #3 · answered by kydivemaster09 2 · 0⤊ 0⤋
blow back requires that there be a heavy mass behind the chamber that has enough inertia that it won't blow back until the bullet has traveled down the barrel. for rifle caliber ammunition, this weight will have to be several pounds, and the action of the rifle will be harsh on the rifleman's shoulder. in a gas system, the breech stays locked and pressures stay high until the bullet has passed a certain point in the barrel. this allows for greater velocity and a lighter firearm
2007-10-11 10:12:49 · answer #4 · answered by Stand-up Philosopher 5 · 3⤊ 0⤋
Blowback is usually applied to smaller caliber, less powerful cartridges and normally performs best with ammunition in a narrow power range.
Gas-operated systems are normally either self-adjusting or easily changed for use with lighter or heavier loads.
2007-10-11 10:04:35 · answer #5 · answered by Tom K 6 · 2⤊ 0⤋
Gas system the recoil is more controlled, making it easier to get back on target
2007-10-11 23:23:04 · answer #6 · answered by .45 Peacemaker 7 · 1⤊ 0⤋
the blow back system has a more of a chance of breaking down because gas is fead directly into the reciver and particles stay in there which are harder to clean. also a gas fead blow back system is less accurate
2007-10-11 10:00:12 · answer #7 · answered by cabrerapir 2 · 0⤊ 4⤋