At Patriot Aims, we do a basic QC check on every semi-automatic pistol, which at a minimum consists of racking the slide to check for any resistance, checking the operation of any manual safeties, and chambering and ejecting a round from the magazine (we use snap-caps in the store).
While these basic pre-sale checks don't tell us anything about the accuracy or long-term reliability of the gun, they do indicate whether the gun can actually be used as a gun and is more than just a bunch of metal and plastic parts.
When we performed this check on a new Taurus 738TCP, this is what we found:
1). The magazines (2) locked into the handle, but the base plate would not fully seat against the base of the grip.
See the picture.
2). The slide spring was so tight, the slide release button could not be depressed. You had to loosen the tension by pulling back on the slide (two handed operation), before the slide button could be disengaged. This issue would probably have gotten better with successive firings (breaking in) but the magazine issue forced us to reject this gun as a usable weapon.
In other words, what we found was this gun was totally unusable in its current state. Luckily, we were able to verify the problem by substituting a magazine from another 738TCP. With the magazine firmly seated in the handle, the bullets chambered and ejected as designed. This one is going back to the manufacturer.