The Navy got a lesson in procurement when it set out to buy weapons with scopes for use by special forces. The winning, low-priced bidder was then asked to substitute a crucial part with a more expensive one. That led to a messy protest. Federal Drive with Tom Temin got the details from procurement attorney Joseph Petrillo of Petrillo and Powell.\nLearn more about your ad choices. Visit megaphone.fm/adchoices