BT-COVER-BLK.qxd 7/11/05 10:08 AM Page 2
BT Paintball Designs, Inc.
Model BT-4
TM
No part of this document may be copied or reproduced without the prior written
consent of BT Paintball Designs, Inc.
Congratulations on your selection of the BT-4
TM
paintball marker. The BT-4TMis
made to provide you with many years of reliable performance. BT Paintball
Designs, Inc. is honored that you have chosen the BT-4TMas your marker of
choice and hope you enjoy using this high quality product.
BT-4
TM
Specifications
Model.................................................................................................................BT-4
Caliber................................................................................................................. .68
Action....................................................................................................Semi-Automatic
Powered.............................................................CO2 or Compressed Air (HP Output)
Cycle Rate.............................................................................................................13BPS
Main Body Material............................................................................................Aluminum
Accuracy Range.......................................................................................................150+ft
The BT-4TMcomes with a removable barrel system. This feature allows the user
to select a barrel that is most suitable for the playing conditions. Standard barrels are mirror-honed with a step-bore and porting and stock length is 8 inches.
2.
READ OWNER’S MANUAL BEFORE USING.
Rules of Safe Marker Handling
1. Treat every marker as if it were loaded.
2. Never look down the barrel of a paintball marker.
3. Keep your finger off the trigger until ready to shoot.
4. Never point the marker at anything you don’t wish to shoot.
5. Keep the marker on “safe” until ready to shoot.
6. Keep the barrel blocking device in/ on the marker’s muzzle when not shooting.
7. Always remove paintballs and propellant source before disassembly.
8. After removing propellant source, point marker in safe direction and discharge
until marker is degassed.
9. Store the marker unloaded and degassed in a secure place.
10. Follow warnings listed on propellant source for handling and storage.
11. Do not shoot at fragile objects such as windows.
12. Every person within range must wear eye, face and ear protection designed
specifically to stop paintballs and meeting ASTM standard F1776.
13. Always measure your marker’s velocity before playing paintball and never
shoot at velocities in excess of 91.44 meters (300 feet per second).
1.
Velocity Adjustment
1. Always check the velocity of the marker
prior to playing paintball. Different playing
fields may have different maximum velocity limits. At no time should you shoot at
velocities above 300 feet per second.
2. Put on an eye protective device designed
specifically for paintball and make sure
that anyone within range of the BT-4™
does the same.
3. While pointing the marker in a safe direction, remove the barrel blocking device.
4. Point the BT-4™ over a chronograph that
will measure the velocity of the paintballs
discharged by the marker.
5. Set the trigger safety to “fire” (red mark
will show).
6. Pull the trigger and check the reading on
the chronograph.
7. Locate the velocity adjuster screw on the
center of BT-4™, under the name plate.
8. Using a 5/32" hex key, turn the screw
inward or clockwise to reduce the velocity,
and outward or counterclockwise to
increase the velocity of the paintballs
discharged from the marker.
NOTE: Eye protective devices designed specifically for paintball
use must be worn by the operator and anyone within range.
Read this entire manual before loading, attaching a propellant source or in any way
attempting to operate the BT-4
TM
.
Air Cylinder Installation
Loader Installation
1. To install loader check the Slide Away™ Elbow
and loader to make sure they are free from
debris and obstructions.
2. Position Slide Away™ Elbow
3. Using a 3/16" hex wrench, loosen the clamping
screw on the Slide Away™ Elbow to allow the
loader to slide into the top of the elbow.
4. Press the loader into the opening of the Slide
Away™ Elbow until it stops.
5. Align the loader so that the lid is pointing to the
rear and the loader is parallel with the marker.
6. Using a 3/16” hex wrench, tighten the clamping
screw on the Slide Away Elbow™ until snug.
DO NOT over-tighten.
Barrel Installation
1. Make sure marker is degassed, hopper
removed, no paintballs in the feed port or
breech and the safety is set to “safe”.
2. While pointing marker in a safe direction, place
the threaded end of the barrel into the front
opening of the marker body.
3. Turn the barrel clockwise until it stops (do not
over tighten).
4. Adjust the barrel accessories if necessary.
5. Install a barrel blocking device. This can be a
barrel plug or other such device that prevents
the accidental discharge of a paintball.
Air Cylinder Installation
1. Make sure the barrel blocking device is
properly installed and the marker safety is set
to “safe” (red marking on safety will NOT be
visible).
2. While pointing the marker in a safe direction,
cock the marker by pulling the cocking knob
located on the left side of the marker back until
it clicks and stops.
3. Release the cocking knob.
4. The marker is now cocked.
5. Locate the air cylinder adapter. The BT-4™
cylinder adapter is located at the base of the
pistol grip.
6. Position the BT-4™ so that the air cylinder adapter is pointed upwards while keeping the
muzzle of the marker pointed in a safe direction.
7. Insert the threaded cylinder valve end into the adapter.
8. Without pushing the cylinder, twist the cylinder clockwise and allow the threads to draw the
cylinder into the marker until it stops. Your marker is now charged.
DO NOT REMOVE THE VELOCITY
ADJUSTMENT SCREW.
Loading Paintballs
1. Put on an eye protective device designed
specifically for paintball and make sure that
anyone within range of the marker does the
same.
2. Load quality .68 caliber paintballs (leave some
room for paintballs to move about, inside
loader).
SAFETY OFF
SAFETY ON
4.3.
BT-4 ASSAULT, COMBAT & RENTAL MARKER
Parts List Diagram
BT-4 ASSAULT, COMBAT & RENTAL MARKER
Parts List
TEM NO. QTY. DESCRIPTION PART NO.
1 1 Left Upper Receiver BT4-1
2 1 Left Lower Receiver BT4-2
3 1 Right Upper Receiver BT4-3
4 1 Right Lower Receiver BT4-4
5 1 Power Tube BT4-5
6 1 Endcap BT4-6
7 1 Drive Spring Guide BT4-7
8 1 Bolt Handle BT4-8
9 1 Rear Bolt BT4-9
10 1 Bolt Plug BT4-10
11 1 Barrel BT4-11
12 1 Barrel Adapter BT4-12
13 1 Valve Body BT4-13
14 1 Internal Valve Seat BT4-14
15 1 Plunger Cup BT4-15
16 1 Rear Valve Seat BT4-16
17 1 Valve Stem BT4-17
18 1 Cup Seal BT4-18
19 1 Ball Latch Housing BT4-19
20 1 Ball Latch Bearing BT4-20
21 1 Expansion Chamber Plug BT4-21
22 1 Feed Elbow Latch Cap BT4-22
23 1 Trigger Guard BT4-23
24 2 Lower Receiver Nut BT4-24
25 2 Lower Receiver Screw BT4-25
26 2 Trigger Plate BT4-26
27 1 Trigger BT4-27
28 2 Trigger Plate Spacer BT4-28
29 1 Sear BT4-29
30 1 Safety BT4-30
31 1 Trigger Slider BT4-31
32 1 Front Bolt BT4-32
33 1 Linkage Arm BT4-33
34 1 Feed Elbow BT4-34
35 1 Feed Elbow Latch BT4-35
36 2 Long Receiver Bolt BT4-36
37 4 Short Receiver Bolt BT4-37
TEM NO. QTY. DESCRIPTION PART NO.
38 6 Receiver Nuts BT4-38
39 2 Valve Screw BT4-39
40 1 Velocity Screw BT4-40
41 2 Grip Nut BT4-41
42 1 Feed Elbow Pinch Bolt BT4-42
43 1 Feed Elbow Nut BT4-43
44 1 Feed Elbow washer BT4-44
45 2 Tank Adapter Nuts BT4-45
46 1 Front Bolt O-Ring BT4-46
47 2 Internal Valve O-Ring BT4-47
48 2 Rear Bolt & Valve O-Ring BT4-48
49 1 Shock Absorber O-Ring BT4-49
50 2 Safety O-Ring BT4-50
51 1 Tank Adapter BT4-51
52 1 45 Rubber Grip BT4-52
53 4 Grip Screws BT4-53
54 1 Right Rear Sight BT4-54
55 1 Left Rear Sight BT4-55
56 1 Front Grip BT4-56
57 1 Front Grip Bolt BT4-57
58 1 Gas Line BT4-58
59 6 Trigger Plate Dowel Pins BT4-59
60 2 Trigger Dowel Pins BT4-60
61 1 Long Tank Adapter Bolt BT4-61
62 1 Short Tank Adapter Bolt BT4-62
63 1 Front Grip O-Ring BT4-63
64 1 Valve Snap Ring BT4-64
65 1 Trigger Guard Screw BT4-65
66 1 Internal Valve Screw BT4-66
67 1 Ball Detente Spring BT4-67
68 1 Trigger Return Spring BT4-68
69 1 Drive Spring BT4-69
70 1 Sear Spring BT4-70
71 1 Feed Elbow Latch Spring BT4-71
72 1 Trigger Slider Spring BT4-72
73 1 Barrel Adapter O-Ring BT4-73
74 1 Name Plate Sticker BT4-74
TM
TM
6.5.
Proper storage of the marker
When you are finished using the BT-4™ it is important that you prepare the marker for
storage. This will not only serve to increase the life of the marker, but will assure optimum performance on your next outing.
Unloading
1. Put on an eye protective device designed specifically for paintball and make sure that anyone
within range of the BT-4™ does the same.
2. Make sure the barrel blocking device is properly installed and the marker safety is set to “safe”.
3. Loosen the loader clamping screw.
4. While holding the paintball hopper in place, invert the marker so that the hopper is below the
BT-4™.
5. Remove the hopper and all paintballs.
6. While pointing the BT-4™ in a safe direction, remove the barrel blocking device and set the
safety to “fire”.
7. Keep the BT-4™ pointed in a safe direction and pull the trigger several times to insure there
are no balls remaining in the chamber or the barrel.
8. Properly re-install the barrel blocking device and set the safety on “safe”.
Removing The Air Supply
1. Make sure the barrel blocking device is properly installed and the BT-4™ safety is set to “safe”.
2. Point the BT-4™ in a safe direction and turn the cylinder counter clockwise about 3/4 of a turn.
This allows the cylinder valve to close without damaging the cylinder O-ring.
3. While pointing the BT-4™ in a safe direction, disengage the safety (set to “fire”).
4. Keeping the BT-4™ pointed in a safe direction, pull the trigger until the remaining CO2 or air is
expelled and it fails to re-cock.
5. Unscrew the cylinder from the BT-4™.
6. The marker is now ready to be cleaned or put away for future use.
Cleaning the marker
Once the BT-4™ is unloaded and the air cylinder is removed, you can use a damp cloth to wipe
off paint, oil, dirt and debris. You can also use warm water to rinse the marker clean. Once your
marker is clean and dry you can re-oil using a light, premium marker oil. (Note: Petroleum based
and aerosol products can damage your markers o-rings. DO NOT USE ANY PETROLEUM
BASED OR AEROSOL PRODUCTS ON YOUR MARKER.) To access the rear bolt and linkage
arm you must remove the left receiver half. (See marker disassembly section.)
Always store the marker in a secure location when not in use so as
to prevent access by unauthorized persons.
Disassembly and field stripping
(MARKER MUST BE UNLOADED, DEGASSED AND UNCOCKED BEFORE ANY DISAS-
SEMBLY. FOLLOW UNLOADING AND REMOVING AIR SUPPLY STEPS.)
Remove The Barrel
Turn the barrel counter clockwise to remove from the marker.
Vertical Front Foregrip Removal/Relocation
The vertical foregrip may be removed or may be relocated along the lower
picatinny rail as needed. To remove or adjust location:
Note: If relocating make sure marker is pointed in a safe direction, barrel blocking
device is installed and safety is set to safe.
.
1. Turn vertical foregrip retainer counter clockwise to allow retention pin to drop. A coin
may be used to assist in turning the vertical foregrip retainer.
2. Slide foregrip to preferred location or remove if so desired.
3. Reverse process to replace foregrip.
Note that the retention pin must line up in a gap on the picatinny rail.
8.7.
Rear Notch Sight Removal/Relocation
The rear notch sight may be removed or may be relocated along the upper picatinny rail
as needed. To remove or adjust location:
Note: If relocating make sure marker is pointed in a safe direction, barrel blocking
device is installed and safety is set to safe.
1. Using a 1/8
" hex wrench loosen the rear sight retaining screw.
2. Slide rear sight to preferred location or remove if so desired.
3. Reverse process to replace rear sight.
Slide Away Elbow Removal/Relocation
The Slide Away
TM
Elbow may be removed or may be relocated along the upper picatinny rail as needed (such as when required to insert a pull through squeegee). To remove
or adjust location:
Note: If relocating make sure marker is pointed in a safe direction, barrel blocking
device is installed and safety is set to safe.
1. Press and hold the retention button located on the name plate side of the
Slide Away
TM
Elbow.
2. Move the Slide AwayTMElbow to preferred location or remove if desired.
3. Reverse process to replace Slide Away
TM
Elbow.
Note: Spring loaded retention button must line up in a gap on the picatinny rail.
Trigger Frame Removal
1. Remove the two grip retention screws from the pistol grip. Note: If the acorn shoulder nuts located in the pistol grip do not fall out after the screws are removed, then
press them out with a small hex wrench or screwdriver.
Accessing Internal Components
1. Remove the Cocking Handle Cover (rubber bonnet).
2. Lay on a flat surface with the name plate facing up.
3. Remove the four upper receiver retention screws.
Note: The retention screw located below the cocking handle slot is longer then the rest.
4. Lift name plate receiver half away from other receiver half.
End Cap
CAUTION: May be under spring tension.
1. Carefully remove rear plug, spring guide, bumper o-ring and spring.
Hammer, Cocking Handle and Connecting Rod Removal
1. Rotate Hammer counter-clockwise.
2. Remove Connecting Rod.
3. Remove Cocking Handle.
4. Slide Hammer rearward and remove.
Barrel Adapter, Ball Retainer and Bolt Removal
1. Lift away Barrel Adapter (and barrel if still installed).
2. Lift out Ball Retainer.
3. Slide Bolt forward and remove.
Disassembly beyond this point should only be done by trained personnel.
10.9.
Reassembly
To reassemble the marker, reverse the Disassembly instructions starting with the barrel
adapter, ball retainer and bolt removal. While reassembling the marker, you should oil
all O-rings and sliding parts. All parts and o-rings returned to the marker should be free
of debris and visual nicks and scratches which can alter the performance of the marker. All screws returned to the marker must be tightened so there is no chance of them
vibrating loose.
STORAGE AND TRANSPORTATION
1. BT-4
TM
must be clear of all paint and propellant when not being used.
2. Be sure to have marker in “SAFE MODE” when not in use.
3. Make sure barrel blocking devise is in place.
4. Store BT-4™ and propellant in cool dry place.
5. Keep your BT-4™ away from children without proper supervision.
6. Your BT-4™ must be free of all paint and not attached to a propellant
source while being transported to and from the playing field.
7. Observe and obey all local, state and federal laws concerning the
transportation of paintball markers. For information concerning any of
the laws in your area, contact your local law enforcement.
BT PAINTBALL DESIGNS, INC.
LIMITED WARRANTY
BT PAINTBALL DESIGNS, INC. warrants the replacement of any original part due to
defect in material and/or workmanship of this marker. This warranty will be in effect for
twelve (12) months for parts and twelve (12) months for labor following the original date
of purchase for the original purchaser. Such warranty service will be provided only if the
warranty registration card included with this manual is filled in completely and on file at
BT PAINTBALL DESIGNS, INC. All other service will be duly charged for and returned
via UPS C.O.D.
BT PAINTBALL DESIGNS, INC. will replace without charge any original part that is
determined by BT PAINTBALL DESIGNS, INC. to be defective under the terms of this
warranty. However, shipping charges are not covered hereunder. Failure due to an
accident, abuse, neglect, modification, normal wear, operator error, maintenance by
other than an authorized BT PAINTBALL DESIGNS, INC. dealer, or use of parts
inconsistent with the use originally intended for the marker as sold, is not covered by
this warranty.
There are no other warranties or guarantees, expressed or implied, made by BT PAINTBALL DESIGNS, INC. on this marker. The sole and exclusive liability of BT PAINTBALL
DESIGNS, INC. and/or its authorized dealers, affiliates, or agents pursuant to this warranty will be for repair or replacement of the defective part; incidental or consequential
damages are expressly excluded hereunder.
BT PAINTBALL DESIGNS, INC., its authorized dealers, affiliates, or agents, will not be
liable under this warranty, nor under any state or federal law, or the common law or otherwise for any damage or failure, including personal injury, resulting from such use
and/or alteration. This warranty gives you specific legal rights, and you may also have
other rights that may vary from state to state.
For warranty parts, service or information contact:
BT PAINTBALL DESIGNS, INC.
3305 EAST WASHINGTON BLVD.
FORT WAYNE, INDIANA 46803
260-424-9100
info@btpaintball.com
12.11.
NOTES:
14.13.
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33330055 EE.. WWAASSHHIINNGGTTOONN BBOOUULLEEVVAARRDD
FFOORRTT WWAAYYNNEE,, IINNDDIIAANNAA 4466880033
wwwwww..bbttppaaiinnttbbaallll..ccoomm
This is not a toy. Misuse may cause serious
injury or death. Eye protection designed specifically for paintball must be worn by the user and
persons within range. Recommend 18 years of
age or older to purchase. Persons under 18
years of age must have adult supervision.
READ THIS MANUAL BEFORE USING.
BT-COVER-BLK.qxd 7/11/05 10:08 AM Page 1
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