simonrichter
New member
Is there a formula for calculating the spring force in a straight blowback handgun with a given cartridge impulse and slide weight?
Thx
Thx
It's not irrelevant.if the spring force was irrelevant
Is there such a critter as a multi caliber blowback?I still don't get it - if the spring force was irrelevant for the blowback action, why would you have to change the spring e.g. when changing caliber in multi-caliber pistols?
The HK HK4 was offered as a 4-caliber kit with .22LR, .25 ACP, .32 ACP, and .380 ACP barrels. It was also offered in 2-caliber centerfire/rimfire combos, most commonly .22LR and .380 ACP. The pistol incorporated a mechanism to switch the firing pin position as needed for rimfire and centerfire, although I don't recall the design details.Hal said:Is there such a critter as a multi caliber blowback?
For example, the Beretta 81 and 84 can exchange calibers with a simple barrel and magazine swap; the recoil springs are actually the same!
Is there such a critter as a multi caliber blowback?