John,
The HK 4 and HSc are very similar in design but not the same. I have an HK 4 and actually never thought to do a side by side comparison, now I have a project for tonight!
The big design change was the interchangability of calibers with the HK. The slide has a firing pin that by turning a screw will go from center fire to rim fire so the .22LR cartridge can be used.
The HK 4 was the first semi auto pistol introduced by HK into the US and works in 4 calibers, .22LR, .25, .32ACP and .380.
It is a clever design and may have been more popular in places that have limits on how many guns you can own since it is essentially 4 in 1. However, it is not that reliable in .22 as my gun has many misfires.
In my opinion the HK P7 K3 is a much better pistol. It has the same squeeze cocking mechanism as the P7 but uses an oil filled buffer and does not have the gas port that makes the P7 heat up. Also, the .22 kit has a seperate slide and functions flawlessly. This gun has 3 conversions in .22LR, .32ACP and .380. It is my favorite HK pistol!
Mark
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