Gemtech OASIS Manual

TM-OASIS
OPERATION AND MAINTENANCE
OF SOUND SUPPRESSOR
MODEL OASIS and OASIS-R
Before using this suppressor,
be certain you have read and
understand this manual.
Manufactured by
GEMTECH
Div. of Gemini Technologies, Inc.
P.O. Box 140618
Boise, Idaho 83714
ISSUED: August 15, 2011

 WARNING  
Because sound suppressed weapons
make less noise than non-suppressed
weapons, it is easy to forget that they are
still firearms. It is of vital importance to re-
member that a sound suppressed firearm
is just as dangerous as a non-suppressed
one, and the same safe handling require-
ments apply.
Published by:
ATI Star Press
Antares Technologies, Inc.
P.O. Box 140618
Boise, Idaho 83714
Phone: [phone]
COPYRIGHT NOTICE:
©2011 Gemini Technologies, Inc.
All rights reserved. The contents of this publication may not be
reproduced in any form or by any means in whole or in part without
the prior written permission of the copyright owner.
TM-OASIS
FIRST EDITION August 2006
SECOND EDITION December 2006
THIRD EDITION August 2011

OASIS Series
OPERATIONAL MANUAL FOR
SOUND SUPPRESSOR MODELS
OASIS (MK-1, 2, 3) and OASIS-R (10/22 Rifle)
Manufactured by
GEMTECH
Division of Gemini Technologies, Inc.
P.O. Box 140618
Boise, Idaho 83714-0618
Phone: [phone]
FAX: [phone]
CONTENTS:
General Description.........................................................................P. 2
Model Differences............................................................................P. 2
Installation........................................................................................P. 3
Ammunition Recommendation.........................................................P. 3
Cleaning & Maintenance..................................................................P. 3
Physical Specifications ....................................................................P. 5
Limited Warranty and Repair Policy.................................................P. 5
GEMTECH PROPRIETARY
This document contains proprietary information of Gemtech and
is submitted to the receiver in confidence.Any reproduction, use
and/or disclosure of this and/or any portion thereof is expressly
prohibited without the express written permission of Gemtech

SOUND SUPPRESSOR MODEL OASIS P.
 WARNING 
Failure to follow installation and maintenance instructions
detailed in this manual can result in potential for serious
injury to the user and damage to the weapon. Firearm sound
suppressors are user attached firearm muzzle devices, and as
such are subject to improper attachment unless the proper pro-
cedures outlined in this manual are followed.
MANUFACTURER’S DISCLAIMER
The manufacturer is not responsible for improper usage of this
product. This product is potentially dangerous, and as such it is the
user’s responsibility to understand and implement its proper use. If
youdonotunderstandthe instructions inthis manual, pleasecontact
the manufacturer for further clarification.
GENERAL DESCRIPTION
TheOASISseries ishighlyadvanced integrallysuppressed.22 rimfire
suppressor system. The OASIS consists of a special barrel that has been
counter bored and has had a baffle stack inserted. High tensile strength
aluminumhas beenused forall partstoprovideanultra-lightweightsuppres-
sionsystem.No packingmaterialsare usedinthese units.Westronglyrec-
ommend against the use of any fluid or ablative agents in the suppressor.
MODEL DIFFERENCES
The OASIS is a complete an integrally suppressed aluminum upper
receiver designed to replace the original upper receiver on the Ruger MK2
or MK3 pistol and is only 1.5 inches longer than the original Ruger bull bar-
rel target pistol. The suppressed top end (machined from a solid aluminum
billet with a precision alloy steel target barrel liner) includes adjustable
target sights and utilizes the bolt, magazine, and grip assembly from the
host weapon.
The OASIS-R (Rifle) consists of a custom barrel assembly with a sup-
pressor built integral to the front of the barrel similar to the OASIS pistol.
The overall length of the suppressed barrel is shorter and lighter weight
than the original non-suppressed barrel, and the diameter of 0.920 inch is
identicaltothat ofthe customtargetbarrels.The suppressedbarrelis made
from a solid billet of high tensile strength aluminum with a precision rifled
bore liner and a suppressor integrated into the front of the barrel. Optical
sights are required.
2

SOUND SUPPRESSOR MODEL OASIS P.
INSTALLATION
If you do not have a copy of the instruction manual for the underlying
Ruger weapon (MK2, MK3, 22/45, 10/22, or 77/22), one is available at no
charge from: Sturm Ruger & Co, Inc., Southport, CT 06490.
To install the pistol version of the OASIS, field strip the pistol following
Ruger’s printed instructions. Re-assemble using the OASIS suppressed
aluminum upper receiver in place of the original Ruger barreled receiver.
Toinstall theOASIS-R suppressedbarrel,removethereceiver fromthe
stockandremove thebarrelfrom the receiveraccording to Ruger’sprinted
instructions. The barrel is retained by two 3/16 inch hex cap screws. The
Oasis-Rbarrelshould bea snughandfit andnot requireforce.If necessary
the shank may be lightly sanded with some 320 grit emery paper. When
installing the new barrel, torque the cap screws to 30 inch-lbs.
AMMUNITION RECOMMENDATIONS
For optimum terminal ballistics, the barrel is not ported to reduce ve-
locity. While most high velocity .22LR ammunition will remain subsonic in
the OASIS pistol, we strongly recommend the use of Gemtech Subsonic
or CCI standard velocity ammunition for both the pistol and rifle versions.
High velocity ammunition will be supersonic in the rifle version, generating
a ballistic crack of the supersonic projectile. The weapons will function reli-
ably with subsonic or standard velocity .22 rimfire ammunition.
The Aguilla SSS 60 gr. subsonic ammunition does not always
stabilize in barrel twists readily available and can yaw badly on exit
from the rifling. This will seriously damage the internal components
of your suppressor, and use of this ammunition is at the user’s risk
and will void the warranty.
 DANGER 
Before performing any maintenance operation, always
remove the magazine from the firearm, open the action, and
visually ascertain that the chamber is empty and the weapon
unloaded. Failure to do so can result in potential for serious
injury to the user and others in the vicinity.
CLEANING and MAINTENANCE
The design of the OASIS series allows for maintenance without
disassembly. There are no solvents that will dissolve carbon, and the use
of solvents may cause clumping and solidification of powder residues.
3

SOUND SUPPRESSOR MODEL OASIS P.
Experience indicates that the preferred method of cleaning the suppres-
sor is blowing it out with high pressure compressed air. While soaking in
hydrocarbon-based solvents is acceptable, water-based cleaning agents
must never be used. After use of any solvent, the suppressor should be
thoroughly blown out with high pressure compressed air.
 CAUTION 
Always read the warning label on any cleaner or solvent, and
remember that virtually all solvents are inherently dangerous
and potentially toxic.Always use adequate ventilation and both
skin and eye protection when using organic solvents.
Thereisno needwhatsoever todisassemblethe suppressorfor main-
tenance, and any attempt at disassembly will void the warranty.
1. Remove the magazine from the weapon, open the action, and visually
ascertain that the weapon is unloaded with nothing remaining in the
chamber.
2.Wesuggestthatatapproximately500roundsthefirearmbefieldstripped
andcleaned thoroughly.Refertotheappropriate Rugermanualforproper
procedure of field stripping the weapon.
3. The weapon bore may be cleaned with a brass brush or a pull-through
snake or mop. Patches must not be used, as they will catch in the baffle
stack, requiring factory service to remove.
4. You may use a solvent such as WD-40®, a mixture of mineral spirits and
type “A”Automatic Transmission Fluid (3:1), Kroil, or Varsol. Never use
a solvent containing ammonia, acids, or other alkali, and do not
use water based cleaning agents. Ultrasonic cleaners can damage
aluminum and do not cavitate without water and should not be used.
Any residual solvent should be drained to the rear and blown out with
compressed air.
 CAUTION 
Use a mop or brush instead of patches to clean the barrel
with the integral suppressor, as a patch may become lodged
in the baffle stack, necessitating factory removal.
4

SOUND SUPPRESSOR MODEL OASIS P.
5
WARRANTY STATEMENT
Our “warranty” has been practiced since our personnel started in the
suppressor business in 1976, in a time before legalese and when a hand-
shakeandthis simplestatement sufficed:“If aGemtech productbreaksand
it’s your fault, we’ll fix it for a fair price in a timely manner. If it’s our fault,
we’ll fix it quickly at no charge.” This policy born of pride in craftsmanship
and honor has served us and our clients well for over two decades and will
continue in Gemtech’s future.
The small print follows:
The Magnuson-Moss Act (Public Law 93-637) does not require any seller or manufacturer
of a consumer product to give a written warranty. It does provide that if a written warranty is
given, it must be designated at “full” or as “limited” and sets minimum standards for a “full”
warranty.
As do most major firearms manufacturers (including Ruger, Browning, & Heckler & Koch),
Gemtech has elected not to provide any written warranty, either “limited” or “full,” rather than
to attempt to comply with the provisions of the Magnuson-Moss Act and the regulations is-
sued thereunder.
There are certain implied warranties under state law with respect to sales of consumer
goods.As the extent and interpretation of these implied warranties varies from state to state,
you should refer to your state statutes.
Gemtech certifies that all sound suppressors manufactured by them are free of defects
in materials or workmanship, and that they meet manufacturing specifications at the time of
manufacture.
It is our intent that the customer be completely satisfied with the product. Certain Gemtech
products may be classified as ordnance and/or implements of war and are sold by us with
the specific understanding that Gemtech has taken every reasonable precaution in providing
our customers with inherently safe merchandise, and that we assume no liability whatsoever
for unsafe handling by the purchaser or his agents. Gemtech assumes no responsibility
whatsoever and we will honor no claims for damages, regardless of nature, for physical injury
or property damage resulting from careless and/or irresponsible handling, adjustments to
equipment, neglect or abuse.
Gemtech reserves the right to make changes at any time and without notice, in prices, to
change specification or design, to add or remove accessory materials, and to add or delete
items without incurring any obligation.
Use of ammunition that does not meet SAAMI specifications will void all warranties.
REPAIR POLICY
Gemtechmaintainscomplete repair facilities forallsuppressorsmanufactured
by them. Return authorization and shipping instructions must be obtained prior to
return. Contact Gemtech for this information.
ATF no longer requires transfer on a Form 5 to the manufacturer for repair.
However, they do require a letter accompanying the weapon detailing the repairs
required. ATF also requires proof of ownership, which is satisfied by a photocopy
of the front of the owner’s Form 3, 4, or 5.
PHYSICAL SPECIFICATIONS:
OASIS Pistol OASIS Rifle
Suppressed Length: 11 in 16.5 in
Original Length: 9.3 in 18.5 in
Suppressed Weight: 6.7 oz 14 oz

All Gemtech products are
100% manufactured in the
United States of America.