I certainly hope you do not get your hands on an original AR-180 and abuse it like that. The reason is an original AR-180 is a prized collectors item.
The AR-180, modern day AR-15, M-16 and todays M-4, lineage actually began with the Armalite AR-10. In 1955 the Army wanted a replacement for the M1 Garand, Armalite submitted the 7.62 mm AR-10 for consideration. No one had seen a military rifle like the AR-10, it had an aircraft grade aluminum receiver and weighed less than seven pounds, the bolt locked into a steel extension on the barrel and not into the receiver itself, its stock and furniture were plastic. The Springfield Armory T-44 and T-48 (which was a version of the FN FAL) were submitted earlier than the Armalite and they used wood and traditional steel/forged construction. The head start Springfield had could not be overcome by Armalite and they lost the race to be have the AR-10 adopted, the Springfield Armory T-44 was adopted as the M-14 rifle in 1959. However, in 1956 U.S. Army officials asked ArmaLite to develop a lighter smaller caliber version of the 7.62 caliber AR-10, the rifle developed was a 5.56 mm cartridge development model called the AR-15.
The AR-15 was too late to be considered against the T-44 and T-48 and did not fit into the long-range marksmanship doctrine of that time period. Armalite then turned its attention to the international military market and the AR-10 was licensed to the Dutch Artillerie Inrichtingen for sale on the international military market. Sales were very limited at best, no one had ever seen a rifle like this, it was radically different from the more traditional wood/steel models already in use or being purchased. Armalite licensed the designs and trademarks of the AR-10 and AR-15 to Colt in 1959 (eventually selling them completly to Colt). In 1959 Armalite developed the AR-16 based upon the AR-10 design but the AR-16 was dropped in development. The AR-16 was a sheet metal version of the AR-10, it never entered production but elements of its design influenced the 1995 design of the AR-10B.
Colt had managed to have the newly acquired (from Armalite) patent AR-15 design adopted by the U.S. military. Armalite was in trouble, they had sold the AR-15 patent too early to Colt, and the AR-10 had failed to attract its intended market and they had sold that patent to Colt as well. Armalite needed to recover from those errors and began development of a new rifle that would not violate the Stoner gas system patents which now belonged to Colt in the AR-10 and AR-15 patents. When the U.S. military adopted the AR-15 it gave legitimacy to the 5.56 mm cartridge, Armalite needed to compete in its effort to replace the AR-15, the result was the AR-18 using the 5.56 mm cartridge beginning development in 1963 and becoming the Armalite primary focus for about 20 years. The AR-18 used the things learned from the AR-15 and AR-16 development and was a sheet metal AR-15 with a different gas system using a Tokarev style sliding gas cylinder under the handguards. The U.S. Army was directed to re-evaluate the AR-18 in 1969, however, the AR-18 failed to displace the AR-15 which by 1969 had been completly standardized by the U.S. Army. There were eventually two versions of the AR-18, the standard AR-18 with selective fire and the AR-18S with selective fire and short 10.12 inch barrel that had a cone shaped flash suppressor. The AR-18S was manufacturered by Sterling, sometimes its incorrectly thought and argued the 'S' in the designation stands for 'Sterling' but it doesn't and stands for 'short' in recognition of the 10.12 inch barrel. Nederlandsche Wapen-en Munitiefabriek (NWM) of Den Bosch, the Netherlands, received a production license for the AR-18 but its not factually known if any AR-18's were actually produced by them. There have been a few claims over the years of at least 20 being made by NWM but the claims have never been substantiated and there is no documentation of manufacturing, shipments, or production schedules which indicate any AR-18s were made by NWM. Its thought that NWM after receiving the AR-18 license also began getting overtures from Stoner for the Stoner 63 platform and decided not to produce the AR-18 as a result.
The AR-18, designed at ArmaLite by Arthur Miller along with George Sullivan and Charles Dorchester in 1963, has been the inspiration for later weapons such as the British SA-80, SAR-80 and SR-88 from Singapore, Austrian Steyr AUG, Heckler and Koch G36, and the Japanese Howa Type 89. After rejecting the AR-18 for military use the British copied the AR-18 design into a bullpup version called the SA-80 which was adopted by the British military as the L85, the bullpup conversion from AR-18 to the SA-80 was by Enfield. Another bullpup version of the AR-18 was the Australian Bushmaster M17S.
With military market sales being a failure, Armalite shifted to the commercial market and produced a commercial semi-auto only version of the AR-18 called the AR-180. Production of the AR-18 continued by Armalite for about 20 years and all production of the AR-18 line ceased in 1979. Howa ceased production of the AR-18/AR-180 in 1974 when Japanese government export controls forced Howa to cease all small arms production. Sterling produced both the AR-18 and AR-180 from 1975 to 1983, but then continued with just limited AR-180 production until 1985 then ceased production.
And thats how the AR-180 came to be. In 2001 Armalite resurrected the AR-180 in a somewhat modified form as the AR-180B intended for the civilian and law enforcement markets. The AR-180B featured the same AR-18 layout and action but used a molded polymer lower, has a standard AR-15 trigger group and rear sight parts along with an AR-15 magazine release and uses standard AR-15/M16 magazines, but excludes the original AR-18/180 spring loaded dust cover for the cocking handle slot. The AR-180B replaced the original folding buttstock and flash suppressor with a plastic fixed buttstock of the same shape and a muzzle recoil compensator.
Had it not been for the Armalite AR-10 the AR-15 would not have existed and Colt would never have gotten the contract for the U.S. military rifle adopted as the M-16 and from that evolving into todays military and civilian M4 type platform would not exist. Had the AR-15 not existed its likely the military and commercial markets would be seeing use of an Armalite developed and marketed design in the AR-10 lineage through the Armalite AR-18 and AR-15 platform and Colt would probably not be in business today. From 1994 to present, Armalite has produced an 'M4' platform available, marketed, and sold to civilian, government/military, and law enforcement markets except they call their series the M-15.
All original AR-180's are collectors items. Among those prized as collectors items are those AR-180s produced by Howa between October 1970 and 1973. Its the fact that most of those Howa produced AR-180s during that period never made it to their intended market which makes them a rare and prized find. The Irish Republican Army illegally acquired a number of those Howa produced AR-180s, estimates place the number at around 70% (up to possibly 75%) of the Howa production during that time period. The IRA loved the AR-18 and had dubbed it the 'Widow Maker' but AR-18 production was very limited by Howa and the ones produced were mostly on an as needed basis to fill orders from recognized government entities and thus very few went to the open market so it was difficult for the IRA to get enough AR-18s and they turned their attention to the AR-180. The IRA knew the AR-180 was the AR-18 in a semi-auto only version and with very little effort they could add auto-fire capability to the Howa AR-180 in about 15 minutes and thus have the AR-18 they favored. The IRA actions caused the Japanese government to stop all exports of AR-18 and AR-180 rifles in 1973 (but later resumed export of the AR-180 until 1974). So if you come upon an original AR-180 its a collectors item, and if you come upon a Howa produced AR-180 manufactured between October 1970 and 1973 its a prize and its a good chance its either one of the few from that period which did make it to market which makes it very rare or one of the ones the IRA had gotten their hands on which later found its way into the second and third party sales markets and is even more rare.
Notes for the above time periods: In 1967 production of the AR-18 began at the Howa Machinery Company of Nagoya, Japan. For political reasons the Japanese government restricted rifle sales to only non-combatant non-Asian nations and during the Vietnam War the AR-18 could not be exported to the United States. Howa also produced AR-180s. In mid-1968 ArmaLite set up pilot production in its Costa Mesa plant and produced 1,171 AR-18s and 4,018 AR-180s between July 1969 and June 1972. The Japanese government subsequently eased export restrictions and allowed the Howa AR-180 to be exported to the U.S. and by the late 1970s U.S. production halted. The Japanese restrictions on export of the AR-18 and AR 180 forced ArmaLite to move production to a new licensed producer, Sterling Armament Company of Dagenham, England, in 1974.
ArmaLite imported the Sterling rifles into the U.S., Sterling and ArmaLite both tried to market the rifles internationally. Sterling manufactured 12,362 AR-180s between the 1975 and 1983 (when ArmaLite and Sterling were both sold). Of the Sterling AR-180s, 10,946 were exported to the United States. There were only 1,171 AR-18s and 4,018 AR-180s produced in the U.S. at Costa Mesa, all others are Sterling or Howa produced. Howa produced 3,927 AR-180s between October 1970 and February 1974 and allowing for the IRA illegally procured AR-180s this leaves only approximately 1,178 Howa produced AR-180s exported, the exact number exported to the U.S. is not known, however, estimates place the number at approximately 900 Howa AR-180s exported to the U.S.
For import/export considerations: Considering the possibility all of the Costa Mesa AR-180s were not exported but were sold in the U.S., and considering the possibility that all Sterling produced AR-180s imported into the U.S. remained in and were sold in the U.S., and considering the possibility that all (estimated approximately) 900 exported to the U.S. Howa AR-180s remained in and were sold in the U.S. - this makes for possibly approximately 15,864 AR-180's sold in the U.S.
The exact number of AR-180's manufactured between 1963 and 1967 is unknown. However, some estimates have placed it has high as approximately 1,100 and some estimates have placed it lower at approximately 400. The exact number has possibly been lost to history as Armalite changed ownership multiple times.
Note: Stoner 63 platform rifle, carbine, commando, and light machine gun varient configurations were adopted by the U.S. Army, U.S. Marine Corps, and U.S. Navy (one adoption) in the designations; XM22 (Stoner 63 rifle 1:12 twist barrel), XM22E1 (Stoner 63A rifle 1:12 twist barrel), XM22E2 (Stoner 63A rifle 1:9 twist barrel), XM23 (Stoner 63 carbine 1:12 twist barrel), XM23E1 (Stoner 63A carbine 1:12 twist barrel), XM23E2 (Stoner 63A carbine 1:9 twist barrel), XM207 (Stoner 63 light machine gun 1:12 twist barrel), XM207E1 (Stoner 63A light machine gun 1:12 twist barrel), XM207E2 (Stoner 63A light machine gun 1:9 twist barrel), Mk 23 Mod 0 (U.S. Navy, their only adoption of the Stoner 63 platform - Stoner 63A1 commando configuration 1:12 twist barrel)