XGA HS507K Footprint & Compatibility Guide: Will It Fit Your Subcompact Pistol?
Introduction
Adding a micro red dot to your concealed carry setup transforms target acquisition speed and shooting accuracy. However, navigating optic footprint compatibility is often the most confusing part of the upgrade process. Selecting the wrong footprint can result in fitment issues, improper screw lengths, or unexpected adapter plate requirements.
The XGA HS507K Micro Red Dot Sight ($179.00) is engineered to the industry-standard “K-Footprint” (a modified Shield RMSc footprint). This comprehensive mounting guide breaks down exact pistol slide compatibility, adapter requirements, and key installation tips for a rock-solid zero.
Understanding the XGA K-Footprint Standard
Standard Shield RMSc optics cuts feature four corner recoil posts. The K-footprint modifies this design by removing the rear recoil lugs and lowering the height of the front lugs slightly.
By utilizing this refined geometry, the XGA HS507K sits lower on narrow slimline slides without requiring deep, structural slide modifications, ensuring a low-profile co-witness with suppressor-height or standard iron sights.
Handgun Compatibility Overview
Direct Fit / Native Mount (No Adapter Needed):
Sig Sauer: P365X, P365XL, P365 Macro
Springfield Armory: Hellcat OSP (newer K-cut models)
Taurus: GX4
Ruger: MAX-9
Requires Thin Adapter Plate or Post Modification:
Glock: 43X MOS / 48 MOS (requires a thin adapter plate or filing down rear recoil posts)
Smith & Wesson: M&P Shield Plus (requires K-plate)
Uncompromised Zero Retention Under Heavy Recoil
Subcompact handguns experience high slide velocities and sharp g-force recoil. A poorly fitted or structurally weak optic can easily lose zero or suffer internal flickering.
Built for Hard Use: The XGA HS507K undergoes rigorous mechanical shock testing—including direct impact tests where the optic body is repeatedly struck against hard wood blocks. The internal LED emitter and adjustment turrets hold exact zero under continuous, heavy recoil cycles.
4 Steps for a Rock-Solid Optic Installation
Prep the Threads: Clean slide mounting holes and screws thoroughly with isopropyl alcohol to remove oil and debris.
Apply Threadlocker: Apply a small drop of medium-strength threadlocker (Blue Loctite 242/243) to the mounting screw threads.
Torque to Spec: Tighten mounting screws to 12–15 in-lbs using a calibrated torque wrench.
Cure Time: Allow the threadlocker to cure for 24 hours before heading to the range.
Get Battle-Tested Precision for $179.00
Eliminate fitment guesswork and upgrade your subcompact handgun with proven durability.
[Order the XGA HS507K Micro Red Dot Sight directly on XGA Shop for $179.00]