Be aware that "pre-ban lowers" and the 1986 machinegun ban are two different animals. The pre-bans are so called "assault weapons" that are grandfathered in. They are still semi-automatic firearms and cannot be converted to machineguns (except for registered sears). They do get to keep their highly dangerous cosmetic features like bayonet lugs and pistol grips.
The 1986 Machinegun Ban stopped the sell of machineguns manufactured after that date to civilians. All machineguns (and sears) registered prior to that date are still fully transferable. If you purchase (and do the paperwork) to acquire the drop in sear, you can put it into an AR manufactured at any time (ie pre-ban or post-ban).
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