M11701 = M1014 Limited Edition. This is a "replica" of the military issue M4, with a non-collapsible skeletonized stock, non-threaded barrel with fixed choke (IC)
M11703 = M4/Super 90 Standard . This is the civilian version of the M4, shipped with the OEM standard synthetic stock (no pistol grip), and a threaded barrel that accepts the full range of Benelli chokes (ships with C, IC, M). The recoil tube is machined to accept the skeletonized stock with the pistol grip accessory, but the stock will not collapse (i.e. makes the shotgun similar to the M11701.
M11707 = M4/Super 90 Standard. This is the civilian version of the M4, *current generation* that ships with the OEM standard synthetic stock, threaded barrel with 2 gas ports. The recoil tube is machined to accept the skeletonized stock with pistol grip accessory, and will allow the stock to collapse.