#ArmaliteAR18

This AR-180B originally had a polymer lower receiver. However it has been updated with a NoDak SPUD AR-180 billet lower receiver. The polymer lowers can break from hard use so a metal replacement is a much needed upgrade. The receiver is threaded for AR buffer tubes however the LOP is still rather long even when the stock is fully collapsed. The AR180B can take any AR-15 style magazines so it is sporting a SureFire 100rd magazine. Ontop of the upper receiver is a QD scope mount with a Nikon P223 scope. The only thing it needs now is removal of the flash hider and threaded for suppressor.

The Armalite AR18 and its civilian counterpart (the AR180) were marketed as affordable alternatives to more expensive designs of the period. While the rifle failed to take off or find a lucrative military contract, the gas system (or elements of it) has been used in many different designs.
In this video we do some shooting with the rifle and take a look at what it made its gas system so enviable.