Holosun 510C GR spring Hole spacing 10 mm –

Hole spacing 10 mm – compatible with Toni System frame mount or direct installation by drilling the frame

Polymer magwell from the Strike Industries production

From the "Gridlok" series

Holosun 507Comp

Holosun 510C GR spring Hole spacing 10 mm –The HE510C GR is an open reflex optical sight designed for rifle and carbine applications. Features include Holosuns Green Super LED with up to 50k hours battery life, Multi Reticle System, Solar Failsafe, and Shake Awake. Green MRS: Circle Dot; 2 MOA Dot; 65 MOA Circle Up to 50,000 Hours Battery Life (Setting 6) 12 Brightness Setting: 10 DL & 2 NV Compatible Convenient Tray Battery Compartment Parallax free & Unlimited Eye Relief Specification