Sorry, but the holster in question is not capable of concealment in any manner suitable for a private citizen...
In addition, this type of holster is a bad idea for other reasons as well. Anything that is held together with bolts, screws and widgets is not well thought out...
Having carried concealed handguns for the past 35 years in all manner of carry, I completely disagree.
For starters, concealment is relative. Some have need to have the weapon in total deep concealment, unable to be observed by the most trained spotter…. but this is not the typical choice, nor is it the most practical for self-defense. These types of holsters and carry modes - which albeit are popular - are very slow to draw from. In the event that the weapon is needed, the amount of time, work and telegraphing needed to extract the piece, almost places it in the category of not having a weapon at all. At worst, they will get the wearer killed in the typical armed encounter. If you are some kind of secret ninja working undercover these deep cover holsters have their place… but that place is limited.
If you are carrying legally for the usual purposes of self-defense, "concealed" does not require or legally mean that level of hiding. I agree that the ALS paddle holster is more suitable for exposed carry; however it can be concealed for most purposes depending the clothing worn… Miami Beach in the summer not being one of them. The newer 5378 is a tighter ride to the body and more concealable. Having said that, ANY paddle holster - or plastic/kydex holster for that matter - is going to be less concealable than a modern leather concealment holster secured with belt slots, or any IWB holster.
But to say that the 5378 is not not concealable as a blanket proposition is not true.
As far as the screws, bolts etc… I have been using Safariland products - paddle, belt slot, duty, tactical - including those containing screws, nuts and bolts, professionally for almost 30 years, under hard use. None of the holster hardware has ever failed or even come loose. Their magazine pouches that contain screws can loosen up and fall out (and this is true for every magazine pouch I've ever used or seen used), but like any piece of gear this usually happens to those that conduct NO inspection or maintenance of ANY of their gear and expect it to perform as issued forever. Nothing will ever satisfy those type of people, in any aspect of life involving man-made products.
I trust Safariland products completely. I don't work for them nor receive any benefits from them. While I prefer leather holsters for concealment, their ALS, SLS and other kydex/plastic/laminate products are reliable and work.