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will this fit the FNX Tactical 45? — 2 Answers

by Cesar, from TX, United States Asked on August 14, 2018

Name Holosun HS510C Riser (4.8)
$23.52 $19.99 Save 15%
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Answered by Jonathan D., Gear Expert, from IL, United States, on July 25, 2019

This goes between a the picatinny rail mount and optic. The HS510C optic this is for is most likely too large for your pistol. The HS507C is a pistol size and fits RMR pattern mounts:

https://www.opticsplanet.com/holosun-micro-red-dot-system-red-dot-sight.html

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Answered by Bill S, member, from MN, United States, on September 01, 2018

This goes between the qd mount for a 1913 pic rail& the 510c. So it changes from absolute to lower 1/3rd co-witness, but it doesn’t change the mounting options. As the mini holosun with 32/2moa circle for may fit, but a 510 c would be far to large imo, for that application. The other holosun listed above, rmr, delta-point pro from leupold, or sig Romeo 1/3 would be some to consider.

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Last updated 2025-11-12 UTC.