Black Rifle Arms 5.56x45 C.A.P.S. Mid Length Piston Upper

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Product Features
Customer Reviews
Questions and Answers
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Ship Requirements

Black Rifle Arms^® C.A.P.S. AR-15 Mid-Length 5.56x45 Piston Upper with Magpul MOE M-Lok Handguard

Q: Will this upper fit on a standard Bushmaster XM-15 Patrollman Carabine lower?

Asked by: Mikhail Belov - 10/31/2025

A: All our AR15 uppers require a MIL-Spec AR15 Lower, so Bushmaster XM15 is a mil-spec lower so there should be no issues.

Answer provided by: Administrator (11/11/2025)

Q: can i use the YANKEE HILL MACHINE CO Mid-Length Diamond Picatinny Handguard on the 5.56x45 C.A.P.S. Mid-Length Piston Upper with Magpul MOE M-Lok Handguard

Asked by: Nick - 4/26/2025

A: Sorry, YMH doesn't make their handguards piston compatible.

Answer provided by: Administrator (4/26/2025)

Q: does the newer magpul SL hand guard fit on this upper?

Asked by: nate - 10/23/2023

A: It is not a drop in fit. It would require some material to be removed so it would fit around the gas block

Answer provided by: Administrator (10/27/2023)

A: It's not a drop in as it would have to be modified to work with our piston system.

Answer provided by: Administrator (11/8/2023)

Q: What does caps stand for?

Asked by: Benjamin Kissel - 3/18/2020

A: Great Question!
C.A.P.S. = COMBAT ADAPTIVE PISTON SYSTEM (we do list these features under the C.A.P.S. Product Feature Tab):
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

Answer provided by: Charles Cassels (3/18/2020)

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5.56x45 C.A.P.S. Mid-Length Piston Upper with Magpul MOE M-Lok Handguard

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Q: Will this upper fit on a standard Bushmaster XM-15 Patrollman Carabine lower?

Q: can i use the YANKEE HILL MACHINE CO Mid-Length Diamond Picatinny Handguard on the 5.56x45 C.A.P.S. Mid-Length Piston Upper with Magpul MOE M-Lok Handguard

Q: does the newer magpul SL hand guard fit on this upper?

Q: What does caps stand for?

Related Items

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CHECKOUT MINIMUM

TIME TO FULFILL ORDERS

AVERAGE SHIPPING TRANSIT TIMES NOT INCLUDING HOLIDAYS

5.56x45 C.A.P.S. Mid-Length Piston Upper with Magpul MOE M-Lok Handguard

Choose Options

Q: Will this upper fit on a standard Bushmaster XM-15 Patrollman Carabine lower?

Q: can i use the YANKEE HILL MACHINE CO Mid-Length Diamond Picatinny Handguard on the 5.56x45 C.A.P.S. Mid-Length Piston Upper with Magpul MOE M-Lok Handguard

Q: does the newer magpul SL hand guard fit on this upper?

Q: What does caps stand for?

Related Items

Recently Viewed Items

AVERAGE SHIPPING TRANSIT TIMES
NOT INCLUDING HOLIDAYS