GSL TECHNOLOGY P90 User manual

REVISED NOVEMBER 2023
P90
Owner’s Manual
Address
5800 Enterprise Dr.
Jackson, MI 49201
PHONE
517-780-9090

Introduction....................................................................
Specifications................................................................
P90 Box Contents...........................................................
Bullet Diameter Warning................................................
P90 Suppressor Mounts..................................................
Mounting the Suppressor on the FN PS90......................
Removing the P90 Suppressor from the Mount..............
Cleaning the P90 Suppressor........................................
Accessories....................................................................
Warnings........................................................................
Warranty Information.....................................................
Manufacturer’s Disclaimer.............................................
TABLE OF CONTENTS
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5
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2

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Thank You for Purchasing the P90!
Thank you for your purchase of a GSL Technology suppressor. We take
pride in our engineering driven products that are now, and will always be,
designed and manufactured entirely in the United States.
With 9 patents to his credit, and over 35 years of suppressor design and
manufacturing experience, our owner and founder Greg Latka has been
one of the driving forces in the suppressor industry.
We are confident that you have in your hands, one of the best firearm
suppressors available today. Marketing hype is one thing, but performance
is entirely different. Our suppressors will quietly perform with the enduring
reliability that you can count on for years to come.
GSL Technology is an engineering, performance driven company. We are
one of the very few ISO 9000 certified companies in the industry. That
means that our company holds itself to a higher level of accountable
quality that remains constant over time.
We strive to design and manufacture the best suppressors available on the
market within their service criteria.
If you are new to suppressors, you are in for a treat. If you’re an old pro, we
hope that you will enjoy the fruits of our labor and spread the word!

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P90 Specifications
Caliber: 5.7X28mm
Sound Reduction: 34 dB
Length: 7.25"
Diameter: 1.375”
Weight: 12.5 oz
Materials: Titanium
Finish: High Temperature Cerakote
Mount: 12x1LH thread (GSL Bi Lock Muzzle Brake included)
Note:
The GSL P90 suppressor is designed specifically to be used with the FN P90, PS90
and FNP90 platforms.
The GSL P90 suppressor is a full auto-rated, titanium suppressor that is built to
handle rugged environments and hard use.
The P90 suppressor is a non-user serviceable suppressor.
P90 Box Contents
Be sure to let us know if anything is either missing or damaged within this box and we
will gladly get you whatever might need to be replaced. Please read this owner’s
manual all the way through prior to shooting as it contains important safety and
operations information. Your GSL P90 suppressor is a high performance tool
designed to give you many years of reliable service.
1) GSL Technology P90 Suppressor
2) GSL Technology Bi-Lock QD Muzzle Brake Mount
3) Loctite 262 Package
4) P90 Suppressor Owner’s Manual

5
Bullet Diameter Warning
DOUBLE CHECK YOUR CHAMBERING prior to attaching the GSL suppressor to your
firearm.
GSL P90 suppressors are designed specifically to be .224". Smaller diameter bullets in
pistol calibers may be used, but will not be optimized for the larger diameter of the P90
baffle/end cap combination.
P90 Suppressor Mounts
to detach and attach muzzle devices. It is recommended that you have this done by a
qualified gunsmith.
The GSL P90 Suppressor is designed specifically to be used with the FN P90, PS90 and
FNP90 and is the most effective/efficient
suppressor for those firearm platforms. Because of this, there is only one mount currently
available for it, the GSL QD Bi-Lock
12x1LH Muzzle Brake. Because of the design of the P90 family of firearms, the barrel must
be removed from the receiver in order

6
Mounting the P90 Suppressor on the FNPS90
4) Check to insure that the suppressor will not rotate after it is seated. Your suppressor is
now both aligned with the bore and ready to be used.
1) Look through the suppressor in order to insure that there are no obstructions, damaged
baffles or a damaged end cap. Shake the suppressor to insure that there is nothing loose
in the suppressor. With an empty firearm, action open, and magazine removed, you are
now ready to install your suppressor.
2) Place the suppressor on the front of the Bi-Lock suppressor mount and rotate the
suppressor until the lugs on the flash hider align with the notches. This can happen in only
one position.
3) After the lugs are aligned, press the suppressor down approximately 3/8” and rotate
clockwise (looking from the muzzle end down) until it will not rotate further. This will be
an approximate 1/4 turn (90°). You are compressing a spring so it will take about 15lbs of
pressure. You will hear and feel the suppressor click into place as it is seated. The
suppressor will pop back forward (away from the firearm) approximately 1/8” as it seats
and locks into place.

7
Removing the P90 Suppressor from the QD Bi-Lock
Suppressor Mount
CAUTION: Suppressors can gain 7-10° F (or more) per round fired and therefore can be
EXTREMELY HOT to the touch depending upon how many rounds were fired and over
what time frame they were fired. Understand that attempting to remove a hot suppressor
without protection (like welder’s gloves) can cause severe injury. Also, do NOT put your
firearm with the suppressor mounted or the suppressor alone when it is hot, into anything
that can be melted or otherwise damaged by heat of up to 700° F or more. Your
suppressor will cool according to ambient temperature and the initial peak temperature
that your suppressor reached, so plan accordingly.
To remove, reverse the steps outlined on page 6.

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Cleaning the P90 Suppressor
Cleaning the P90 suppressor is something that we don’t recommend, it is designed to
shoot tens of thousands of rounds through it without the need for cleaning. Shooting
corrosive primed ammunition can cause damage to any metal surfaces including your
barrel and suppressor, so using such ammunition is never recommended. If you choose to
clean, do not use any products with ammonia in them or water, as these are items that
can cause corrosion. The use of 0000 Steel wool or green ScotchBrite to remove any
buildup on the outside of the flash hider/suppressor mount and the inner mating surfaces
of the suppressor. There is no need to ever clean to the level of bright metal, it is a waste
of time and energy. All you are trying to do is to keep these surfaces clean enough so
that it is easy to mount and unmount the suppressor. Again, we do NOT recommend
cleaning. Cleaning debris can get into the chambers and possibly cause damage.
GSL P90 Accessories
The GSL Technology P90 suppressor is designed for a lifetime of shooting. Some
accessories for this suppressor may be found to make it more useful for your specific
needs. The most up to date list will always be found at gsltechnology. com.

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Warnings
WARNING! Read the operation and maintenance manual in its entirety
before using suppressor. Failure to follow the installation and
maintenance instructions detailed in this manual can result in potential for
serious injury to the user and damage to the weapon.
Verify Firearm is Unloaded. Visually and physically confirm your firearm
is unloaded before attempting or performing any of the procedures in this
manual. Failure to ensure the firearm is unloaded could result in
unintentional discharge, causing injury or death.
BURN WARNING: Allow suppressor to cool to ambient temperature
before removal and/or service. The outside surface temperature of this
suppressor may exceed 40 C/104 F. Therefore protective gloves should be
worn at all times in attaching or detaching the suppressor. Failure to do so
may result in severe burns to hands and any other unprotected skin
surface.
PINCH WARNING: Could be customized to the multi cal (as to changing
out) but in attaching or detaching the can for all cans. *The point of
attachment and detachment is a pinch point and caution should be taken,
including wearing protective gloves, to avoid severe injury at this pinch
point.
MUZZLE WARNING: The muzzle of the firearm is different when a
suppressor is attached. However, this is still the point where the projectile
exits the weapon system and the muzzle should not cover or sweep any
area the user is not wanting to shoot and kill.
SONIC CRACK WARNING: This suppressor will not protect end-users and
those in close proximity from hearing damage when, and if, the projectile
crosses the sound barrier. Thus, proper hearing (and eye protection)
should be worn at all times.

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GSL Technology, Inc. manufacturers all suppressors the highest quality and technical
standards in the industry. However, improper usage by any end-user by this product may
result in serious injury to the user or third parties. Therefore, it is the user’s responsibility to
understand this product and the weapon system used therewith. If you do not understand
the instructions in this manual, please contact GSL Technology for further clarification at
http://www.gsltechnology.com. GSL Technology, Inc. shall have no liability for incidental
or consequential damages and under no circumstances by liable for personal injury, death,
property damage, environmental damage or economic losses of any type caused by the
misuse of this product or negligence on the part of the user. To the extent allowed by law,
all liability from act or omission from improper usage of this suppressor is disclaimed. The
warranty and disclaimer in this manual for the suppressor is subject to all laws which may
limit these terms. To the extent allowed by law, the purchase of this product places an
affirmative duty on any distributor, retailer or user to transmit this manual with the
suppressor.
For the latest, most complete version of this manual, please visit
http://www.gsltechnology.com.
Manufacturer’s Disclaimer
Unconditional Lifetime Warranty. If for any reason you have an issue with a GSL Technology
product, we will repair or replace it free of charge. Warranty does not apply if product is
altered in any way.
Damaged Suppressor: This or any suppressor may not properly operate and create
significant risk of injury or death if damaged or obstructed. Any and all such damage
should be reported to an Armor familiar with this suppressor and the weapon system or it
should be returned with the RA to GSL Technology, Inc. For more information, contact GSL
Technology, Inc. at: [email protected].
Warranty Information