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Combat Adaptive Piston System (C.A.P.S.)
Operators Manual
2
C.A.P.S. PARTS NOMENCLATURE
Spring Guide Return Spring Op-Rod PistonPiston
Cylinder
Gas Block
Takedown Pin
Detent
Adjustment
Knob
Takedown
Pin
Position
Indicator
Bolt CarrierBolt Carrier
Buffer
CAUTION: It is important to always follow safe firearm handling.
Improper handling or misuse may result in property damage, bodily injury, or death!
3
ADJUSTING THE C.A.P.S. REGULATOR
Figure 1 shows the position indicator on the ejection
port side indicating the regulator is in the silencer
setting. This position reduces gas flow to compensate
for silencer back pressure.
Figure 1
The following instructions are to be referenced from the shooters perspective. To rotate the regulator knob between the various gas settings
requires the operator to grasp the knob firmly pressing it forward until it’s interlocking teeth are clear then rotating slightly, release forward
pressure and continue to rotate until the knob auto locks into the next gas setting. The knob may be rotated in either direction a full 360 degrees
with four gas setting at 90 degrees apart. See figures 1 thru 4 below for gas setting specifics.
Figure 2
Figure 2 shows how an operator presses forward on the
adjustment knob to clear the locking teeth allowing
rotation of the adjustment knob between gas settings.
ALWAYS USE THE LOWEST GAS SETTING THAT WILL OPERATE RELIABLY WITH WHATEVER AMMUNITION IS
BEING FIRED, THIS WILL OPTIMIZE THE SYSTEMS PERFORMANCE AND MINIMIZE WEAR.
4
ADJUSTING THE C.A.P.S. REGULATOR CONTINUED
Figure 3 shows the position indicator at the 12 o’clock position
indicating the regulator is in the normal gas setting. This is the
setting for US COMMERCIAL and US MILITARY ammunition
under normal shooting conditions.
Figure 3 Figure 4
Figure 4 shows the position indicator at the shooters left or the 9
o’clock position indicating the high gas setting. This setting is
for adverse conditions or light powered ammunition.
5
ADJUSTING THE C.A.P.S. REGULATOR CONTINUED
Figure 5
Figure 5 shows the position indicator in the 6
o’clock ultra high setting for use with under
powered ammunition and adverse conditions.
Figure 6 shows how the regulator knob can be set half
way between any one of the fixed gas settings to shut the
gas off stopping the system from cycling and effectively
making the rifle a bolt action.
Figure 6
6
Combat Adaptive Piston System (C.A.P.S.)
Disassembly
Figure 1 shows the takedown pin detent being
pressed into the gas block to allow the
takedown pin to be removed. A firing pin or
similar tool may be use for this job.
Figure 2 shows the takedown pin being pushed out of
the gas block allowing the piston assembly to be
removed from the gas block.
Figure 1 Figure 2
7
Combat Adaptive Piston System (C.A.P.S.) Disassembly
Continued
Figure 3 shows removal of the piston assembly after removing the takedown pin by turning the upper receiver assembly muzzle
down and allowing the piston assembly to slide out of the gas block into the operators hand. If the system is heavily fouled it may
require the operator to pull and twist on the adjustment knob to remove the piston assembly free from the gas block.
Figure 3
Figure 3
8
Combat Adaptive Piston System (C.A.P.S.)
Cleaning and Maintenance
• For quick field cleaning simply wipe out the upper receiver and wipe off the bolt carrier with a rag, add
a few drops of lubricant to the carrier and reassemble.
• For a thorough cleaning disassemble the C.A.P.S. piston assembly in to its individual parts and with a
gun cleaner of your choice follow the brands cleaning instructions. For detailed cleaning instruction for
your AR-15 type rifle we recommend consulting a US military technical manual such as ARMY TM 9-
1005-319-23&P
• Most owners will clean and maintain their C.A.P.S. system well above what is required. For others who
use the C.A.P.S system daily they may only do a thorough cleaning when reliability suffers. Although
the C.A.P.S. system in daily use is nearly maintenance free, we do recommend routine inspection and
cleaning as needed to prevent corrosion. The C.A.P.S. system should be thoroughly cleaned and
lubricated before lengthy storage to prevent corrosion.
• We recommend wiping off any excess lubricant from the piston and piston cylinder before placing the
system in service because excess lubricant accelerates fouling buildup by providing a base for fouling to
adhere to then it burns off leaving only burnt on carbon / fouling behind.
• The use of corrosive ammunition is not recommended and if ever used will require an immediate and
extensive cleaning process to prevent corrosion. The corrosive ammunition cleaning process is beyond
the scope of this manual and customers are advised not to use corrosive ammunition.
• Do NOT use Ammonia base products on Nickel Boron Carrier.
9
Figure 1 illustrates how the individual parts go together to makeup the piston assembly. First Insert the piston (2)
into the piston cylinder (1), now press the spring guide (4), into the return spring (5), then press the return spring (5),
into place on the op-rod (3). Turn to page (10) to complete the assembly process.
Combat Adaptive Piston System (C.A.P.S.)
Reassembly
Figure 1
Piston 2
Piston Cylinder 1
Op-rod 3
Spring Guide 4
Spring 5
Takedown Pin Slot
10
Combat Adaptive Piston System (C.A.P.S.)
Reassembly Continued
Figure 2 Figure 3
Figure 2 shows the piston assembly being reinstalled in the
gas block. Be sure the takedown pin slot in the piston
cylinder is aligned with the takedown pin while pushing
the takedown pin thru the gas bock.
Figure 3 shows how the takedown pin is captured by the
takedown pin detent when properly installed thru the
regulator and gas block.
Hold the upper receiver assembly muzzle down and run the piston assembly through the gas block until the
takedown pin slot of the piston cylinder aligns with the takedown pin bore of the gas block, See Figure 2. Then
press the takedown pin flush with the gas block, insuring that the takedown pin detent captures the takedown
pin as shown in Figure 3. That completes the reassemble process.
11
Combat Adaptive Piston System (C.A.P.S.) Features:
– 4 Position Regulated Gas System
– Pull Through Gas Block Design
– Ambi-Regulator Knob
– 360° Continual Rotation
– Easily Adjustable with One Hand
– Easily Adjustable with Gloves On
– Easily Adjustable from Firing Position
– Audible and Palpable Setting Confirmation
– No Detent Pin to Push In to Adjust Gas Regulator
– Regulator Knob Allows for Zero Visibility Adjustment
– Interlocking Mechanism Prevents Accidental Rotation of Knob
– Knob Configured for Rapid Adjustment with No Loss of Target Engagement
For more information on Black Rifle Arms products please visit us at:
Online Store: www.blackriflearms.com
YouTube Channel: http://www.youtube.com/user/BlackRifleArms
Facebook Page: https://www.facebook.com/blackriflearms
Black Rifle Arms
New Smyrna Beach, FL 32168
386.428.7960