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alvin · 01-20-2008, 09:54 AM

I put my white gloves on, took the only Parabellum out from the gun safe, moved the toggle and measured the position.....and thought about it.

I have to say "CLASSIC IS CLASSIC".

Heinz -- You're absolutely right. Things became complex when the toggle knob touches the frame ears. When the receiver moves back around 0.22", toggle knob reaches the frame ears, and at this moment, the receiver has *not* run out of its rail yet (the receiver could move back around 0.38" before it runs out of rail). Receiver and barrel's kinetic energy transfers to the toggle link when the knob impacts with the frame. The implication -- Every Parabellum pistol has a "built-in" accelerator which transfers barrel/receiver recoil energy to the toggle/breech block. Unlike other pistols, the energy transfer and bolt acceleration is by default without adding extra parts. Most recoil energy (fixed value given a type of ammo) is transferred to the toggle at the moment of impact regardless of initial energy allocation by weight before the toggle hits the frame ears.

Historically, there may or may not have pre-war 9m/m Carbine, arm researchers and advanced collectors could continue working on that. Based on above analysis, I assume regular 9m/m could operate a Carbine without problem because of the "default bolt acceleration".

01-20-2008, 09:54 AM	#50
alvin User Join Date: Jul 2007 Location: US Posts: 3,843 Thanks: 132 Thanked 729 Times in 438 Posts	I put my white gloves on, took the only Parabellum out from the gun safe, moved the toggle and measured the position.....and thought about it. I have to say "CLASSIC IS CLASSIC". Heinz -- You're absolutely right. Things became complex when the toggle knob touches the frame ears. When the receiver moves back around 0.22", toggle knob reaches the frame ears, and at this moment, the receiver has not run out of its rail yet (the receiver could move back around 0.38" before it runs out of rail). Receiver and barrel's kinetic energy transfers to the toggle link when the knob impacts with the frame. The implication -- Every Parabellum pistol has a "built-in" accelerator which transfers barrel/receiver recoil energy to the toggle/breech block. Unlike other pistols, the energy transfer and bolt acceleration is by default without adding extra parts. Most recoil energy (fixed value given a type of ammo) is transferred to the toggle at the moment of impact regardless of initial energy allocation by weight before the toggle hits the frame ears. Historically, there may or may not have pre-war 9m/m Carbine, arm researchers and advanced collectors could continue working on that. Based on above analysis, I assume regular 9m/m could operate a Carbine without problem because of the "default bolt acceleration".