AR-15 M16 Replacement CTR Carbine Butt Stock Commercial - Black - Magpul

AR-15 M16 Replacement CTR Carbine Butt Stock Commercial - Black - Magpul

Item #: MPMAG311


In Stock for Immediate Shipping

Manufacturer MPN:
Magpul MAG311

UPC: 873750001548
Weight: 0.57 pounds

Product Description

The patent-pending Magpul CTR (Compact / Type Restricted - Commercial Model) is a drop-in replacement butt stock for carbines using commercial receiver extension tubes. Designed for light, fast action the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation. The extra-power lock mechanism uses a premium chrome-silicon spring to avert auto-collapse failure and maintains strength by resisting spring relaxation. 

The CTR also features a supplemental friction lock system that eliminates wobble for enhanced weapon stability and accuracy. The Commercial Model includes an extended 0.55" rubber butt-pad to provide positive shoulder purchase and accomodates longer slant-back extension tubes.  Made in USA.

Mounts on Commercial Carbine Receiver Extension tube (Not included)
Premium chrome-silicon spring provides positive locking and long service life
Supplemental friction lock eliminates accuracy robbing wobble
Sloping cheek weld combines a slim profile with user comfort
Shielded release latch prevents snagging and accidental operation
Side mounting slots accept optional cheek risers for NON-AR15 / M16 applications
Compatible with Single-Point sling mounts
Sling Mounts
Rear - Push-button QD sling mounts accommodate up to 1.5" swivels (Ambidextrous) 
Rear / Bottom - 1.25" Sling loops
Toe - Lanyard hole for custom para-cord rigs

Included Accessories
Extended Rubber Butt-Pad, 0.55" (Removable)

Weight, Stock Body: 0.57 lb.
Weight, w/ Receiver Extension: 0.98 lb.
Length, Stock Body: 7.15 in.
LOP Adjustment Range: 3.8 in.
LOP, M4 Collapsed: 10.4 in.
LOP, M4 Extended: 14.5 in.

** Friction lock performance may vary depending on the receiver extension's dimensional tolerances.
** Specifications based on extended-length (slant-back) M4 Carbine Receiver Extension and may vary depending on tube specifications.

This item or some of its components cannot be exported from the United States of America without a valid export permit from the U.S. State Dept. Unfortunately, this also includes APO addresses due to ITAR restrictions.

CTR Stock Install Instructions

Step 1:  Remove Existing Stock

Remove existing stock per armory guidelines. Refer to US Army TM 9-1005-319-23&P for assistance.

Step 2: Install CTR Stock

DO NOT FORCE PARTS TOGETHER!! Align the stock body with the carbine receiver extension and gently slide together until the stock stops (approx. 2-1/8”). Depress release latch with one hand. With the other hand, grasp both ends of release pin and pull down firmly. Push stock forward to mount.

NOTE: If stock does not easily slide over receiver extension, refer to fit guide on box.

Step 3: Friction Lock Test

With the stock installed and secured in position, depress the friction lock to minimize movement.

NOTE: Friction Lock performance may vary depending on exact receiver extension size.

Step 4: Verify Install

Perform final inspection including function test per US Army TM 9-1005-319-23&P Unit and Direct Support Maintenance Manual to verify correct installation. If you experience any issues during installation, please refer to the “Related Info” tab, located on the product page at Always test fire your weapon before using it in an operational environment.

Removing CTR Stock

Depress release latch with one hand. With the other hand grasp both ends of the release pin and pull down firmly. Pull the stock body clear of the carbine receiver extension.

                CTR Stock Adjustment Instructions

Extend/Collapse Stock

Fully depress the release latch and pull the stock rearward to extend or push stock forward to collapse. Intermediate positions may be selected by depressing the release latch and moving the stock back to the desired position. When desired position is found re-engage friction lock bolt for best results.

Remove Rubber Butt Pad

Use a 1/8” hex key to remove the two butt pad screws. Using a bullet tip or flat head screwdriver, depress the two top snap hooks to release the pad. Install optional polymer Carbine Butt Cap if desired.

WARNING: The CTR commercial model has an extended .55” rubber butt pad to accommodate extended-length receiver extensions (buffer tubes). Removal of the butt pad is not recommended since the extension tube may protrude past the end of the stock in the fully collapsed position and may cause discomfort or injury during use.

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