Below are Holosun's C-Series optics offered at the best price with free shipping and returns. These optics include the 407C, 507C, and 507C ACSS Vulcan.

These optics have an RMR, so they will fit any RMR slide cut or optics plate which is very common.

They have 50k hours of battery life, come in red or green reticles, have shake awake, solar failsafes, are IP67 waterproof, have strong 7075 T6 aluminum housings, and have side removable batteries.

The 407C has a 2 MOA reticle, the 507C has the MRS Reticle, and the 507C ACSS Vulcan has the ACSS Vulcan reticle.