The new AR-180B has a fixed stock that does not fold like the stock on the original AR-180, though it does match it in profile. With the recent expiration of the 1994 Assault Weapons Ban, the folding stock may once again become available on the AR-180B.
Like the original AR-180, the new AR-180B has no external bolt lock. If you'd like to lock the bolt open there are two ways to do it. The easiest way is to lock an unloaded magazine into place and pull the bolt handle rearward. That will lock the bolt to the rear, and the magazine can then be removed. The other way is to stick a finger up into the magazine well and push the internal bolt lock into position while pulling back on the bolt handle. It's not as awkward as it sounds and becomes second nature after a couple outings with the rifle.[PAGEBREAK]
Perhaps the best new feature on the AR-180B is that it now takes any AR-15 magazine. Original AR-180s used a proprietary magazine that was not interchangeable with any other magazines. Fortunately, the new AR-180B can now operate with an M-16 or AR-15 magazine of any capacity.
Also, the lock work of the lower receiver, i.e. the hammer, sear, disconnector, and trigger, can be interchanged with AR-15 parts. If you'd like to fit your new AR-180B with a match trigger, any of the aftermarket kits for the AR-15 will work.
ArmaLite stamps the upper receiver of the AR-180B from a single piece of sheet metal, just like the original rifles. But the welds are neatly dressed, and the cosmetics of the new rifle are far superior to those of the original guns. Especially those manufactured by Sterling. The upper is stamped with the ArmaLite logo on the left side along with the model designation and caliber.