Investments is my day job and from what I hear, Bass Pro really overpaid- 26% above what Barron's had as full value. They will be taking on a ton of debt to add to what they already have. They are going to need to sell assets to help pay it down, though I don't think there's much overlap in store locations. Their buying power will go up, but with all that debt to service, I doubt you'll see lower prices.
There's a chance that down the road they will go public to raise money, but don't hold your breath, they will need to pay down debt first.
Aside from guns and ammo, competing with the likes of Amazon and other online retailers is a pretty tough business. That's also why Bass Pro stores have so much space devoted to boats and vehicles - expensive, higher-margin items that are tough to ship. They must make decent markups on clothing too, because there is a whole lot of floor space devoted to clothing.