Sig Sauer P320-M18 Rail-Mounted Compensator

Carefully read and follow the instructions below to avoid damaging your compensator and firearm. Failure to follow these instructions may result in injury to the shooter and damage to the compensator and firearm.  As the Customer, you acknowledge and agree that it is solely your responsibility for complying with these procedures and checking your compensator regularly. We are not responsible for damage to the compensator or firearm. 

Check Gap Clearance: Ensure there is a gap between the slide and the compensator to prevent any interference with the slide's operation.

Upgrading your handgun with a compensator requires a higher level of maintenance and care. Ensuring that it is installed correctly and checked frequently is critical for proper function and safety. 

Results may vary depending on the handler. Vantage Point Armory is not in any way responsible for the misuse of firearms or firearm parts/accessories or the results of such misuse. We highly recommend gun owners inspect parts and accessories frequently. This will help mitigate the possibility of accidents and malfunctions.

*The Vantage Point Compensator is intended for use on OEM pistols only - VPA does not guarantee function or reliability with aftermarket or modified guns

DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by Sig Sauer™. Sig Sauer™ does not warrant or represent that this product is compatible with Archon Firearms pistols.

DISCLAIMER: Neither Vantage Point Armory, LLC nor this site are affiliated in any manner with, or otherwise endorsed by Sig Sauer™. The use of “Sig Sauer” on this page is merely to advertise the sale of Sig Sauer pistols, parts, or components. Components and parts that do not specifically have Sig Sauer listed as the manufacturer are made by their respective company. Such parts may be intended for use with Sig Sauer components but are not produced by Sig Sauer. For additional genuine Sig Sauer products and parts visit www.sigsauer.com

 Step-by-Step Instructions for Assembling the Sig Sauer P320 M18 Rail-Mounted Compensator (video instructions linked here): 

Before you begin, ensure you have the following:

• VP Armory Sig Sauer P320-M18 Rail-Mounted Compensator
• Two lock bars (included with Compensator)
• Two Extended-Tip Set Screws (included with Compensator)
• Torque Wrench with 3/32” Allen Key (recommended) or 3/32” Allen Wrench
• Sig Sauer P320-M18
• Loctite
• All screws must have a medium-strength, medium-to-high temperature threadlocker applied in accordance with their manufacturer's instructions. We recommend a small application of Green Loctite 290 on each screw. Blue Loctite 246, 242, or 248, are also acceptable if you intend to remove the compensator more regularly, but these products are more likely to loosen under an aggressive firing schedule.

Installation Steps

1.   Prepare the Firearm:

• Ensure your firearm is unloaded and safe to handle before beginning any installation process.
• Ensure your rail is clean.

1. Insert the Lock Bars:

• Take the two lock bars and slide them into the rail slots on your pistol. For the M18, use the first and third rail slots.

1. Position the Compensator:

• Slide the compensator over the lock bars, aligning the screw holes on the compensator with the threaded holes on the lock bars.
• Ensure the screw holes are centered for proper alignment.

1. Secure the Screws:

• Insert the screws into the compensator holes.
• Begin threading the screws into the lock bars, ensuring that the screws align with the depressions milled into the lock bars.
• If you feel resistance and the screw head sits above the compensator surface, it is not properly seated. Adjust as necessary to ensure the screws are fully threaded into place.

1. Tighten the Screws:

• Using a torque wrench, tighten the screws to 5 in-lbs.
• If desired, apply a small amount of Loctite to the screws before tightening for added security during firing.
• Note: The use of Loctite is essential to ensure the screws do not back out over time with firing.

1. Verify Fitment:

• Check that the screws are flush with or slightly below the compensator surface. This ensures the screws are properly locked into place.
• Inspect the fitment between the compensator and the firearm to confirm there is no interference. There should be a .020 gap between the slide and the compensator.

1. Allow For Drying Time:

• Allow the assembly to dry for at least a day to ensure the Loctite sets properly.
• Witness mark all screws with an oil-based paint pen for future reference to detect any loosening.
• The first time the firearm is fired with the compensator installed, the screws should be checked after the first few shots to ensure it has been installed properly.
• Regularly check your witness marks to ensure that the screws have not loosened. If they loosen during firing, re-torque them immediately.
• If any of the attachment screws become damaged or loose, do not attempt to fire the handgun with the compensator attached. You will need to replace the screw.

1. Final Check:

• Confirm all screws are secure and flush with the compensator surface.
• Ensure there is no movement or wiggle between the compensator and the firearm.

Important Notes:

• Alignment is Key: Proper alignment of the screws with the lock bars is essential for secure installation.
• Use Loctite: For enhanced security, apply Loctite to the screws to prevent loosening during use.

Check Gap Clearance: Ensure there is a gap between the slide and the compensator to prevent any interference with the slide's operation.

Upgrading your handgun with a compensator requires a higher level of maintenance and care. Ensuring that it is installed correctly and checked frequently is critical for proper function and safety. 

Results may vary depending on the handler. Vantage Point Armory is not in any way responsible for the misuse of firearms or firearm parts/accessories or the results of such misuse. We highly recommend gun owners inspect parts and accessories frequently. This will help mitigate the possibility of accidents and malfunctions.

*The Vantage Point Compensator is intended for use on OEM pistols only - VPA does not guarantee function or reliability with aftermarket or modified guns

How to Clean Residue from Your Firearm & Compensator

Residue buildup is completely normal—it’s just carbon and fouling left behind from firing. Over time, it can collect on your firearm and compensator, especially around muzzle devices. The good news? It’s easy to clean off, and it doesn’t damage or remove your Cerakote finish when handled properly.

Important note: We’ve seen cases where people try to scrub off the residue too aggressively, which actually ends up polishing the carbon rather than removing it. This can give the illusion that the Cerakote is coming off—but it’s really just shiny residue left behind.

Regular maintenance keeps your setup performing smoothly and helps prolong the life of your gear. In this guide, we’ll walk you through how to properly clean that buildup and get your firearm looking and functioning like it should.

Click here to view our recommendation on how to clean residue from your firearm and compensator. 

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