C.A.P.S. OPERATORS MANUAL

Combat Adaptive Piston System (C.A.P.S.)

Operators Manual

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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!

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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.

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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.

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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

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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

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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

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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.

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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.


Reassembly

Figure 1

Piston 2

Piston Cylinder 1

Op-rod 3

Spring Guide 4

Spring 5

Takedown Pin Slot

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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.

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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

https://www.facebook.com/blackriflearms

C.A.P.S. OPERATORS MANUAL

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