RCA had to update their "cost no object," highly reliable military/commercial product and the AR-88 was the result.Design stages probably date from as early as 1939 and the demands of WWII in Europe pushed RCA into having the AR-88 ready by early 1941.Over the past decade, the angle of AR pistol grip has been a major factor in deciphering between the different options on the market.
Currently the R6xxx and some of the military 3-digit series are covered, but not all of the information is complete.
Some sources have claimed that the development of the HJ-10 benefited from Israeli, Ukrainian and Russian technologies, but according to the official releases of the Chinese government, the system is a completely indigenously developed weapon.
Supporters of these claims have used the fact that the prolonged development of the HJ-10 as the evidence of Chinese indigenous development, the Chinese industrial and technological bases were not capable enough in the 1980s and most of the 1990s, which protracted the development time.
At this time the only AR style weapons were equipped with a full length fixed rifle stock, and common shooting stances included an elbow out and more upright stance.
This angle tends to be a top choice while shooting with an upright stance and/or a full length or fully extended stock.