another new luger owner needs help !

unspellable · 07-03-2002, 02:03 AM

Thor,

My experiments with recoil springs are far from complete and the jury is still out, but the preliminary results make me think a long soft spring is better than a shiort stiff spring for light loads. Of course this begs the question of where you get the long soft spring, where as the short stiff one can be had by clipping the standard spring.

Also, while the hold open must reliably engage on the last round, I am thinking it takes a bit more than that. On the last round the magazine is empty. With one or more rounds in the magazine the top cartridge is pressed up against the underside of the block and adds drag on the back stroke.

We've run an analysis of the action and the recoil spring doesn't absorb anything like the whole of the energy imparted to the cannon by the cartridge impulse. The firing pin spring absorbs some, but a great deal more than you would think must be lost to friction. I think the top cartridge dragging on the underside of the breech block accounts for a lot of this. If you look, you'll see a streak of brass on the underside of the breechblock after a shooting session..

unspellable

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07-03-2002, 02:03 AM	#11
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 769 Thanks: 0 Thanked 20 Times in 12 Posts	Thor, My experiments with recoil springs are far from complete and the jury is still out, but the preliminary results make me think a long soft spring is better than a shiort stiff spring for light loads. Of course this begs the question of where you get the long soft spring, where as the short stiff one can be had by clipping the standard spring. Also, while the hold open must reliably engage on the last round, I am thinking it takes a bit more than that. On the last round the magazine is empty. With one or more rounds in the magazine the top cartridge is pressed up against the underside of the block and adds drag on the back stroke. We've run an analysis of the action and the recoil spring doesn't absorb anything like the whole of the energy imparted to the cannon by the cartridge impulse. The firing pin spring absorbs some, but a great deal more than you would think must be lost to friction. I think the top cartridge dragging on the underside of the breech block accounts for a lot of this. If you look, you'll see a streak of brass on the underside of the breechblock after a shooting session.. unspellable