Arisaka Defense makes a good line of hand stops, finger stops, foregrips, and indexers. Their latest release is a Hand Stop for M-Lok compatible weapons... "The Patent Pending Arisaka Hand Stop is a continuation of our low profile, minimal control accessories. The primary goal of this accessory is to aid the user in pulling their rifle into their shoulder, enhancing control and recoil mitigation.
Rainier Media House takes a quick look of at the Fortis Shift Hand Stop in this video... "Fortis manufacturing's newest product is an addition to their wildly popular SHIFT series forearm grips with a reversible hand stop. We get a first look at their latest product."
New and in stock at Laylax is the Nitro.vo KeyMod Hand Stop. Available in black and tan colours, it is a lightweight product since it is made of glass fibre-reinforced ABS resin. It helps in a having a steady shooting hand allowing for better muzzle control and can also be used as a barricade stop.
Now available for immediate order at Spartan Imports for dealers... "The four-piece XTM Hand Stop Kit serves as a lightweight, low-profile rail mounted index point for improved weapon control, or as a forward stop to prevent the shooter's hand from reaching the hot front sight assembly or muzzle.