If a department offers them a contract they are PROBABLY going to jump on it when they see dollar signs and potential for future business.
If an agency calls your small business and says ' Can you make us 500 ARs with such and such accessories, carry cases, and 4 mags per rifle. And in the future continue to deal with us should we need more'? And oh yea, can you make it the 30rd mags not the 7s.
If they say No, we won't send them with 30rd mags then that's great they are standing to their word but they will lose out on a lot of money. that agency is just going to hang up and offer another company the contract. That company knows its also good advertisement. If people see the police using a certain brand AR that's what they will also want.