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Hi Michael, The only difference is that one is the LE model. In specs everything is the same except the LE model has a speedfeed stock. Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!
The 51771 has a Picatinny rear sight rail for adding a red dot or other optic as well as a rear sight. The 51668 has a rear ghost Ring sight only (No Picatinny Rail mount) and is sold only to "Qualified Professionals" LE only. (Both have the "Speed feed Stock).
The 51668 has a rear ghost Ring sight only (No Picatinny Rail mount) and is sold only to "Qualified Professionals" LE only. The 51771 has a Picatinny rear sight rail for adding a red dot or other optic as well as a rear sight.
