ashokgodara:
I'm afraid that you are quite mistaken regarding the actions of semi automatic pistols:
ashokgodara wrote:in most delayed blow back pistols they use browning cam lock system.where slide have to travel back and disingage from lockig lugs or from ejection port in this process brrel lifts.
The Browning system, as exemplified by the 1911 and the Browning Hi Power, are not delayed blowback systems at all. They are correctly termed short recoil systems, as the action remains solidly locked until after the bullet leaves the barrel and the great majority of gas pressure is vented to the atmosphere by the exit of the bullet. The inertia of the slide then continues and the tipping of the rear of the barrel, by link or cam surface, disengages the barrel's locking from the slide after the slide has traveled a short distance.
This is called a short recoil system to differentiate the action from Browning's long recoil system, as used in the Browning A5 shotgun or Remington Model 8 rifle. In this action, the barrel and bolt travel rearwards fully, while locked together, and then the barrel is released to permit ejection of the spent shell, followed by the bolt releasing to pick up a fresh round from the magazine and reload the weapon.
ashokgodara wrote:where as in berretta locking lugs go down in frame but barrel is straigt position of target.this system is not new it was used in p38 pistols.surprise why berretta 92fs got its positions as most selling hand guns.american army also uses 92fs as side arms.indian army is using them as side arms.glock pistols are among police dippartment butt.they are prone to jamming.may be indian ammo for cause
Again, this is incorrect, as neither the Walther P38 or the Beretta 92 are delayed blowback systems, either. They are also both short recoil systems. However, unlike the Browning short recoil system, the barrel of these pistols does not tip, but recoils in line with the slide for a short distance. The barrel has a lug in which a locking block pivots at the front. When the action is in battery, the locking block is in the raised position, where arms engage the slide on the sides, locking the barrel and slide together. When the pistol is fired, the locked slide and barrel recoil reward, locked together, until an unlocking pin in the barrel lug strikes a surface in the frame. The unlocking pin protruding, engages a ramp in the surface of the locking block and forces it down. Thus the barrel stops when the unlocking pin's rear surface strikes the frame, and the slide is unlocked by the unlocking pin forcing down the locking block. At this point. the slide continues rearward, accomplishing extraction and ejection of the empty case, and then moves forward to pick up a fresh round, load it into the chamber, and then move the whole barrel slide assembly forward, where the locking block is forced upward by a ramp on the bottom of the locking block striking a surface on the frame. This locks the action and readies it for firing again.
The Walther P38 and the Beretta 92 have essentially the same locking short recoil system.
You should recognize that blowback and delayed blowback systems have nothing that positively locks the slide or bolt to the barrel/chamber of a firearm. The blowback system has the recoil spring and the inertia of the slide or bolt that holds the action closed long enough for the bullet to exit the barrel and vent its pressure to the atmosphere before the case is extracted from the chamber. In a delayed recoil system, there is a mechanical advantage conferred by cams, rollers, or other mechanisms that increase the inertial effect of the slide and/or the the recoil spring. The barrel in these actions does not move. But there is no positive lock keeping the action closed as there is in a 1911 Browning tipping barrel short recoil system or in the tipping locking block short recoil P38 type system.
The barrel is often fixed in gas operated semi auto and automatic systems, like the M16/M4 and AK47 systems, but in this case, a rotating bolt (or tipping bolt, as in other systems) is unlocked by a piston, which is powered by gas tapped from a port in the barrel, or bled directly and impinging on the bolt. Still, in all of these cases, the action is kept locked until it is released by mechanical or gas pressure action, after which the bullet has already left the barrel.
In other words, when you are talking about locking lugs in an action, you are not talking about a blowback or delayed blowback action.