First off, even the Mini Clip has some limitations. The adapter works only with Mossberg shotguns, and even then, it's only select 12-gauge models. The clip will work with Mossberg 500, 590, 590A1 and Maverick 88 shotguns.
However, once past that limitation, the options open up. The Mini Clip is easily installed (the company claims that it takes less than 5 seconds), and the adapter allows Mossberg users to take advantage of Aguila MiniShells and other 1.75-inch shotgun shells on the market. Shooters can use birdshot, buckshot and slug shells with the adapter.
The benefit of the MiniShells are numerous. The shells are nearly half the size of traditional shotgun shells, allowing more rounds to be stuffed into a tube magazine and increasing the number of shots available without reloading. Another added benefit is the ability for recoil-sensitive or small-statured shooters to take advantage of the power of a 12-gauge shell without the added recoil.
A Mossberg 590A1 with a 20-inch barrel has a traditional capacity of 8+1. With the adapter and the use of Aguila MiniShells, that capacity increases to 14+1. The adapter itself is molded from a rubberized material and is designed for recreational shooting. The unit was designed and built in Texas and is still made in the USA by a veteran-owned business. The suggested retail price for the OpSol Mini-Clip is $15.