I've tried to explain this before and now I'll try to explain it again. I worked in retail for more than fifty years and the wholesale and retail costs of firearms and firearms related merchandise is unlike that of almost all other merchandise. First, I admit that I've been out of the business for many years now and things have certainly changed to some degree during that time. For example, there are far fewer jobber and distributors, which means less competition than ever. The use of computer based distribution programs is now much more widespread that it was when I was involved. However, in talking with folks who are still in the business, the general practice remains pretty much the same.
Let's start with manufacturers. The "big" manufacturers such as Browning generally don't like to deal with the small local gun shop. Most of the time the "big" manufacturers put all sorts of road blocks in the path of the LGS such as requiring proof of a store front, requiring proof of x dollars in sales, or even proof of a huge line of credit. Then there was the price structure of the "big" guys. If you bought x dollars of merchandise, then the price was y, and the more you bought the lower the price per item went.... most of the time. But then with Browning, for example, if you wanted the best possible price on firearms, you had to buy a specified amount of clothing and/or accessories. Then there was the payment structure. If you paid the balance in x days, the price was y; the longer you took to pay, the higher the price went regardless of the price you had agree upon before this all started. Some called it a "price adjustment" and others called it a "finance charge." With the "big" manufacturers, the general rule was and remains: the bigger your business, the better we will treat you. One result is the big box sporting goods stores in many cases will pay only 60% of the cost that the LGS is forced to pay from the "big" manufacturers, if they are willing to sell direct to the LGS. Another issue with manufacturers that folks don't really understand is that the production numbers are generally pretty low. Even the "big" guys do not have the capacity to produce unlimited numbers of products. For example, when I toured one major manufacturer in the late 1990s, I was surprised to learn it could only produce two different revolvers and two different semi-autos at a time. Those numbers are further limited by production schedules. The "big" manufacturers decide months, sometimes years in advance when they are going to make a product and how many units are going to be made. As a result, not only are numbers limited, generally there are not warehouses or storerooms filled with products simply waiting to be sold. In many cases, the "big" guys will have sold an entire production run of a product to one of the big box stores even before it is produced!
Now let's turn to wholesalers. The same rule applies here: the bigger you are, the better they treat you. But that rule takes many forms. For example, an LGS that does $250,000 a year with a wholesaler will be charged more for an item that a LGS who does $500,000 in business a year with the wholesaler. In my experience that difference may be as little as 2% or as much as 55%, but it's always a significant difference. In addition, the smaller LGS may not even learn of items that the wholesaler has received. Yes, there are computer inventory systems, but the telephone is still important for the sale of limited commodity items. Let's say a wholesaler receives a shipment of desirable items from a manufacturer. The sales people for that distributor know which of their clients really want those items and can afford them; so they call up the LGS and the conversation goes something like this. "We just got in x number of that thing you mentioned that you really wanted. I can let you have y number of those items, if you're willing to take x number of these other items (that nobody really wants) along with it." Now that sales person is usually on some sort of commission or bonus program, so he/she calls the LGS with the deepest pockets first. It is also common for that number of desirable items to be distributed among the salespeople who are often geographically based. So your LGS can be too small to be on the "preferred customer" list or be located in an area of the country where the saleperson for that region was sick that day and all of the items go somewhere else. Another issue with distributors today, is that they often promise items to their LGS customers that they haven't even received as an enticement to get them to buy other stuff. Now its "Have I got a great deal for you. I'll let you have x number of these things when they come in, if you take x amount of this other stuff now." Of course you ask, "what's going to be my price on these desirable things?" and the person responds "Oh, somewhere around $xxx." You think that's great but then the problems really start. First, the items may not show up for days, weeks or even months. Second, the wholesaler may bill your account for the merchandise even though you don't have it and it hasn't even been shipped. And third, when it finally arrives, it turns out to be much more than the price you were quoted, but you go ahead and take it because you know your customers want to see these on your shelves and you don't want to be cut off from these "great deals" in the future.
The point of all this is that there is generally no one fixed price for anything for the LGS. Two LGSs withing a few miles of each other can be charged dramatically different prices -- even different from the prices they had agreed to -- for the same items. Once upon a time, I was standing behind the counter in the "hunting department' I was running when the bright folks from corporate introduced the brilliant, MBA, child wonder they'd hired to oversee the "hunting" program (even then they thought it was politcally unwise to call it a "gun program" or a "firearms program." This person proudly announced that "selling this stuff is just like selling washers and dryers -- you order it, it shows up and people buy it!" That company went bankrupt within 2 years. The "firearms business" is just not as simple as most folks seem to believe. One of my comrades who owned a Christmas tree farm said it was sort of like selling Christmas trees. You just never knew what was going to happen to your product or how much to charge until the last moment!