The A3 Tactical M-LOK Modular Vertical Foregrips w/ Integrated Handstop will cover 2.525" of your rail and uses (2) M-LOK slots.
The A3 Tactical M-LOK Modular Vertical Foregrips will attach to any M-LOK rail system like the one found on the MDP-9. Ensure you check local, state, and federal laws before purchasing a foregrip, as it will convert a pistol to an SBR.
No the A3 Tactical M-LOK Modular Vertical Foregrips w/ Integrated Handstop cannot be used on an AR Pistol.
Yes. If your HK416 .22LR utilizes the M-LOK rail system then the A3 Tactical M-LOK Modular Vertical Foregrip will fit and function as intended on your rifle.
The A3 Tactical M-LOK Modular Vertical Foregrip w/ Integrated Handstop is a straight vertical foregrip (90 degree) with an integrated handstop. A3 Tactical Modular Vertical foregrips are a two-piece design and require a 1/2" deep socket for installation.
No. Adding this foregrip to any pistol violates ATF regulations.