CamSet3P-15 Installation Instructions

Professional Installation Recommendation

Professional Installation Recommended: While the CamSet3P-15 is designed for simple installation and can typically be installed in approximately two minutes, Camtac recommends that all firearm modifications, installations, inspections, and gunsmithing work be performed by a qualified gunsmith. The user assumes responsibility for proper installation, function testing, and safe operation of the firearm

Always perform a complete function check before live fire.

Installation Video

Watch the complete installation and function check video before installing the CamSet3P-15.

Before You Begin

Before beginning installation, verify that you have the following:
Verify the firearm is unloaded.
Remove all ammunition from the work area.
Wear appropriate eye protection.
Verify that the included three-position selector is available for installation.
Required Tools
- 3/16″ Allen wrench – Pistol grip screw
- 3/32″ Allen wrench – Selector lever screws
- 5/64″ Allen wrench – CamSet3P-15 set screw
Read all instructions completely before beginning installation.
Camtac recommends that all installation, inspection, and gunsmithing work be performed by a qualified gunsmith.

Installation Instructions

Step 1 – Verify the Firearm is Unloaded

Point the firearm in a safe direction and verify that it is completely unloaded. Remove the magazine, lock the bolt to the rear, and visually and physically inspect the chamber to ensure no ammunition is present.

⚠️ Remove all ammunition from the work area before proceeding.

Step 2 – Assemble the Three-Position Selector

Assemble the included three-position selector by attaching the selector knob to the selector cylinder using the supplied cap head screws.

The selector cylinder features a small alignment radius that matches the selector knob, allowing the knob to install in only one orientation.

For a right-handed configuration, install the long selector knob on the side opposite the selector detent holes. The short selector knob should be installed on the opposite side.

Left-handed users may reverse this orientation by installing the long selector knob on the opposite side.

Using a 3/32″ Allen wrench, tighten the supplied cap head screws until secure. The screws are supplied with blue threadlocker pre-applied to help prevent loosening during use.

⚠️ Do not overtighten the selector screws.

Step 3 – Separate the Upper and Lower Receivers

Push out the rear takedown pin and front pivot pin, then separate the upper receiver from the lower receiver.

Step 4 – Remove the Factory Safety Selector

Ensure the hammer is in the cocked position.

Using a 3/16″ Allen wrench, loosen the pistol grip screw. In many cases, it is not necessary to completely remove the grip screw. Loosening the grip screw approximately 7–8 turns is often sufficient to remove the selector while retaining the safety detent and spring.

Remove the factory or mil-spec safety selector.

Step 5 – Install the Included Three-Position Selector

Install the assembled three-position selector into the lower receiver with the selector set to either the SAFE or SEMI position.

⚠️ Do not install the selector in the AIDED RESET position during assembly, as interference between the upper and lower receivers may occur when closing the firearm.

Step 6 – Secure the Grip Screw

Using a 3/16″ Allen wrench, retighten the pistol grip screw and verify smooth selector movement between positions.

Step 7 – Partially Reassemble the Firearm

Reconnect the upper and lower receivers using the front pivot pin only. Leave the rear takedown pin disengaged to allow access for positioning and alignment of the CamSet3P-15.

Step 8 – Position the CamSet3P-15

Ensure the hammer is in the cocked position and the three-position selector is set to either SAFE or SEMI.

Place the CamSet3P-15 onto the rear upper receiver lug (rear receiver post). Center the device by eye and, using a 5/64″ Allen wrench, lightly tighten the set screw just enough to prevent the device from falling off the receiver lug.

Do not fully tighten the set screw at this time.

Step 9 – Allow the Device to Self-Align

Slowly close the upper receiver onto the lower receiver. Allow the CamSet3P-15 to self-align as the receivers come together.

Do not force the receivers closed.

Step 10 – Final Tightening

Reopen the upper and lower receivers and, using a 5/64″ Allen wrench, tighten the CamSet3P-15 set screw.

⚠️ Tighten only until secure. Do not overtighten, as excessive force may damage the set screw, screw head, or the CamSet3P-15 device.

Step 11 – Complete Reassembly

Close the upper and lower receivers and fully seat the rear takedown pin.

Function Check

Before loading or firing the firearm, perform a complete function check.

Safety Check

Verify the firearm is unloaded.
Charge the firearm by cycling the bolt and allowing it to return fully into battery.
Place the selector in the SAFE position.
Attempt to pull the trigger.
The hammer must not fall.

Semi-Automatic Check

Verify the firearm is unloaded.
Place the selector in the SEMI position.
Charge the firearm by cycling the bolt and allowing it to return fully into battery.
Pull the trigger and hold it to the rear.
Manually cycle the action.
Slowly release the trigger until the reset is felt.
Pull the trigger again.
The hammer should fall normally, and the firearm should function as a standard semi-automatic rifle.

Important: In the SEMI position, the CamSet3P-15 remains inactive and does not contact or interfere with any fire control group components. The firearm operates as a standard factory semi-automatic rifle.

Aided Reset Check

Verify the firearm is unloaded.
Place the selector in the AIDED RESET position.
Charge the firearm by cycling the bolt and allowing it to return fully into battery.
Verify proper trigger movement and aided reset function.
Refer to the installation video for the complete aided reset function check and operating instructions.

Product Operation

Position 1 – SAFE

Functions as a standard safety.
The trigger should not release the hammer.

Position 2 – SEMI

Standard factory semi-automatic operation.
The CamSet3P-15 remains inactive and does not contact or interfere with any fire control group components.

Position 3 – AIDED RESET ON CLOSE

The CamSet3P-15 engages and provides aided trigger reset operation while maintaining semi-automatic function.
The selector cannot be rotated from the AIDED RESET position while the bolt carrier group is open or locked to the rear. The bolt carrier group must be fully forward and in battery before returning the selector to the SEMI or SAFE positions.

Compatibility Verification

If you experience any issues with installation or operation, verify the following before proceeding with troubleshooting:

Verify the firearm is an AR-15 pattern rifle.
Verify the upper and lower receivers are manufactured to standard AR-15 mil-spec dimensions.
Verify the lower receiver is compatible with mil-spec fire control components.
The included three-position selector
Verify the lower receiver fire control pocket (receiver shelf) depth is approximately 0.625″–0.630″.
Verify an M16-profile bolt carrier group (BCG) is installed.
Verify mil-spec fire control components are installed.
Verify the CamSet3P-15 and three-position selector were installed according to the Installation Instructions.
Verify the firearm functions properly in SAFE and SEMI with the CamSet3P-15 installed before attempting to use the AIDED RESET position.
If using aftermarket components, verify they are compatible with standard AR-15 mil-spec specifications.

Troubleshooting

Device Will Not Align

Verify the selector is installed in the SAFE or SEMI position.
Verify the hammer is in the cocked position.
Ensure the CamSet3P-15 is loosely installed before closing the receivers.
Allow the device to self-align before final tightening.
Verify the upper and lower receivers are manufactured to standard AR-15 mil-spec dimensions.

Inconsistent Operation

Verify the CamSet3P-15 is installed correctly.
Verify the selector is installed and aligned correctly.
Verify compatibility with mil-spec fire control components.
Verify the upper and lower receivers are manufactured to standard AR-15 mil-spec dimensions.
If necessary, loosen the CamSet3P-15 set screw, allow the device to self-align, and retighten.
Refer to the installation video for tuning recommendations.

Failure to Reset

Verify proper installation.
Verify the selector is fully in the AIDED RESET position.
Verify compatibility with mil-spec fire control components.
Verify the firearm functions correctly with the CamSet3P-15 removed.
Verify the upper and lower receivers are manufactured to standard AR-15 mil-spec dimensions.

Selector Will Not Rotate from AIDED RESET

Symptom

The selector cannot be moved from the AIDED RESET position to SEMI or SAFE.

Cause

The bolt carrier group is open, locked to the rear, or not fully in battery.

Solution

Release the bolt carrier group and allow it to move fully forward into battery. Once the bolt carrier group is fully closed, the selector can be rotated normally from the AIDED RESET position to SEMI or SAFE.

Important Safety Information

The CamSet3P-15 is intended for use in AR-15 pattern rifles configured with the included three-position selector.

The purchaser and user are responsible for ensuring proper installation, function testing, and safe operation of the firearm. Always follow safe firearm handling practices and comply with all applicable federal, state, and local laws.

While the CamSet3P-15 is designed for straightforward installation and typically requires approximately two minutes to install after the 3-position selector is assembled, Camtac recommends that all installation, inspection, adjustment, and gunsmithing work be performed by a qualified gunsmith.