Interarms is a good candidate for stress test. I fired around 1000-1500 rounds from an Interarms. It worked fine, no broken parts. The problem experienced was its front sight falling off. I heard similar issue from other shooters.
One day, I will find an Interarms to shoot it to break.... and see how many rounds it can handle. Everyone can try that, it's not a very expensive item.
Loading Luger magazine was painful. The designer obviously did not expect user to shoot hundreds of rounds from a handgun in one session.
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