The idea of a stocked pistol is certainly not new. Cavalry were issued stocked muzzle-loading pistols, and the practice continued through the development of the revolver and autoloading pistol. Some Lugers and virtually all German military and Mausers were made to accept a detachable stock, as were Mauser copies made in Spain and China. Many other major caliber pistols such as the Browning Hi Power, Colt, Bergmann, Mannlicher and Radom Vis. 35 were issued by various military forces with stocks, some with tangent sights. Machine pistols such as the Mauser, Russian Stechkin or the HK VP70 generally had holster stocks to make them more controllable. For the most part, however, over the last decades the idea of stocking pistols had faded in deference to submachine guns, until various stocks for the Glock pistol became available.
A RONI-ized Glock can be enhanced in terms of accuracy with the addition of a reflex sight, flip-up front and rear sights, a light/laser mount, and a sling system.
I knew about these stocks from seeing references to them but only got interested as a result of two conversations I had recently. One was with a former police chief who mentioned that he thought one of the Glock stocks might be useful for a School Resource Officer armed with a Glock since it would give him better long-range accuracy during an active shooter situation without requiring him to figure out how to secure a carbine inside a school. The other conversation was with a friend who heads a close-protection team for a foreign dignitary. Armed with Glocks, the team would like to have carbines but are precluded from doing so.
Keep in mind that in the USA, a Glock with a stock would be an SBR (Short-Barreled Rifle) and would require BATFE registration. However, in considering the Glock stock for School Resource Officers, registering their Glocks would not be a major issue and my foreign friend works in a country where our SBR rules do not apply. In considering the usefulness of the stocked Glock, I was fortunate that a friend of mine has two Glocks registered as SBRs and has available a couple of the stocks which allowed me to evaluate their usefulness by shooting various scenarios with them.