Quick Assembly & Milling Steps

1. Unplug the router, remove the factory router plate and adjustable base, remove the collet, and confirm the spindle and SpeedMill are clean and free of debris.

2. Install the correct SpeedMill size for your router, then install the router adapter plate using the correct mounting method for your router model.

3. Align the buffer screw support with the lower receiver and loosely thread the buffer screw through the support into the lower.

4. Install the correct front takedown pin block to the top plate, then loosely attach the side walls to the top plate.

5. Use a 3/8” drill bit through the side wall bushings to align the walls, then tighten the side walls to the top plate.

6. Place the lower receiver into the jig, align the front takedown pivot pin holes, and insert the correct takedown pin for the platform.

7. Tighten the buffer screw and fasten the buffer screw support to the top plate. Periodically check these screws during milling.

8. Attach the drill block, mount the jig correctly in the vise, and drill the pilot hole with the 21/64” drill bit using cutting fluid.

9. Mill Template 1 with the short guide pins, using slow clockwise motion and advancing one hash mark per pass.

10. Mill Template 2 with the medium guide pins, then stop before moving to the next depth gauge.

11. Mill Template 3 with the long guide pins until the trigger slot is completely formed.

12. Drill trigger, hammer, and selector holes using the 3/8” and 5/32” bits. Drill through one wall at a time, then reposition the jig and repeat for the other wall.

13. Remove the lower from the jig, deburr drilled holes, clean the receiver, and inspect the safety selector detent hole for chips or burrs.

Important Notes

• Read all warnings before drilling or milling and always wear ANSI-rated eye and hearing protection.
• Avoid compressed air for chip clearing because sharp chips can be blown into your eyes.
• Do not exceed one hash mark per pass. Cutting less per pass improves finish quality.
• Milling should be done in slow, small, clockwise circles. Do not mill counter-clockwise.
• Refer to the full PDF for the complete router compatibility chart and legal notice.

Quick Assembly & Milling Steps

1. Align the Buffer Support Plate [D] with the back of the lower receiver, making sure the indexing protrusion and ribs face the lower receiver.

2. Loosely finger-thread the Buffer Screw [E] through the buffer support plate and into the lower receiver.

3. Attach the Pivot Adapter [C] to the Top Plate [A] using 2 Jig Screws [G].

4. Orient both Side Walls [B] with the larger 3/8” bushings toward the rear, then set the top plate on the side walls with the numeral “3” visible through the top plate.

5. Loosely attach both side walls to the top plate using 6 jig screws. Use 3/8” and 5/32” drill bits through the side wall bushings to align the walls, then tighten the screws and remove the bits.

6. Insert the receiver assembly upward from the bottom of the side walls toward the top plate.

7. Align the lower receiver’s pivot pin holes with the pivot adapter and insert the correct quick pin. For AR-15, AR-9, and AR-45, use the smaller rearward pivot adapter hole and silver AR15 Quick Release Pin [H]. For AR-10/LR308, use the larger forward pivot adapter hole and black 308 Quick Release Pin [I].

8. Fasten the buffer support plate to the rear of the top plate using 2 jig screws. Use the inner mounting points for AR-15/9/45 and the outer mounting points for AR-10/LR308.

9. Tighten the buffer screw using a small screwdriver or hex wrench, then attach the Drill Guide [F] to the top plate using 2 jig screws.

10. Secure the completed jig assembly in a vise by the notches at the bottom of the side walls. Do not clamp the jig by the faces of the side walls.

11. Drill the pilot hole with the 21/64” drill bit using cutting fluid. Keep the drill straight and perpendicular, clear chips often, and continue until the bit exits the bottom of the receiver.

12. Install the router adapter plate and correct SpeedMill for your router. Confirm the router base lock/latch is tight and functioning before milling.

13. Mill FCG Step 1 with the short guide pins and Depth Gauge #1. Use small clockwise overlapping motions, clear material each pass, and trace the perimeter until material is no longer being removed.

14. Switch to the medium guide pins and mill FCG Step 2 with Depth Gauge #2, advancing one hash mark or less per pass and applying cutting fluid before each pass.

15. Switch to the long guide pins and mill the trigger slot with Depth Gauge #3 until the trigger slot is completely formed.

16. Clamp the jig on its side and drill the fire selector and pin holes. Drill through only one side of the receiver wall, then flip the jig and repeat for the other side.

17. Remove the receiver from the jig, clean out chips and cutting fluid, inspect drilled holes for burrs, and pay close attention to the safety selector detent hole.

Important Notes

• Wear ANSI Z87.1 approved eye protection and ANSI S3.19 approved ear protection when operating power tools.
• Do not clamp the jig by the faces of the side walls. Clamp only by the notches at the bottom of the side walls.
• Do not exceed one hash mark per pass. Beginners and anyone chasing the best finish should cut less than half a hash mark per pass.
• Use a shop vac to clear chips. Do not use compressed air to blow or clear chips.
• Keep the router adapter plate flat against the top plate and move slowly in small clockwise circles.
• Refer to the full PDF for the router compatibility chart, router tips, warranty terms, and legal notices.

Quick Setup & Operation Notes

1. Read the operator’s manual before using the router. Always wear eye and hearing protection when using power tools.

2. Inspect the router and accessories before use. Do not use the tool if it is missing parts, damaged, or not fully assembled.

3. Unplug the router before assembly, adjustments, changing accessories, removing the base, or performing maintenance.

4. To remove the base, open the quick release lever, hold the base with one hand, hold the top of the router with the other, and pull the motor housing away from the base.

5. To install the SpeedMill, remove the base, depress the spindle lock, loosen and remove the collet nut and collet, then thread the #3C 80% Arms SpeedMill onto the spindle and tighten with a wrench.

6. Do not remove the protective end mill tip cover until ready to begin milling.

7. Remove the subbase before using the router with an Easy Jig Gen 2 or Gen 3 router adapter plate.

8. Check the quick release locking lever before use. The base should not slip when pressure is applied. Adjust the tension hex nut only as needed.

9. Before starting the router, confirm the SpeedMill is securely tightened, the depth of cut is set to the correct Easy Jig hash mark, and the end mill flutes are not touching the workpiece.

10. Turn the router on with the front switch and wait until it reaches full speed before contacting the workpiece.

11. Hold the router firmly with both hands during operation, avoid forcing the feed rate, and allow the cutter to take small, clean cuts.

12. After each pass, turn the router off and wait for the cutter to come to a complete stop before lifting the router from the work surface.

13. Use the Easy Jig depth gauge when setting depth of cut. Do not exceed one hash mark per pass. For best finish quality, use half-hash-mark passes or less.

Important Notes

• The FST-1 is designed for use with 80% Arms SpeedMill tools only.
• Do not use cutters that are not rated for use above 35,000 RPM.
• Do not push the router too fast or make excessively deep cuts, as this can overload the motor and damage the router or cutting tools.
• A deeper cut requires a slower feed rate. Taking too deep of a cut can cause chatter, rough finish, or broken cutters.
• Before maintenance, make sure the switch is off, wait for all moving parts to stop, and disconnect the router from power.
• Refer to the full PDF for complete power tool safety warnings, electrical extension cord guidance, illustrations, maintenance, warranty, and customer service details.

Assembly Steps

1. Place the Bolt Catch [I] into the left side of the lower. Use the Bolt Catch Screw [D] and provided Allen Wrench [H] to secure it. The screw should sit fully inside the hole and flush with the lower receiver.

2. Rotate the lower to the right side to install the ambidextrous functionality.

3. Drop the Plunger [J] and Spring [G] into the right side of the lower so they contact the Bolt Catch [I].

4. Drop the Pin [F] into the same hole used for the plunger and spring. This is the circular hole above where the magazine release button installs.

5. Place the Extended Paddle [B] into the matching paddle-shaped channel.

6. Depress the pin, detent, and spring leftward into the lower receiver. While holding them in place, use the Extended Bolt Catch Screw [E] to secure the extended paddle through the hole on top of the lower receiver.

7. After seating the Extended Bolt Catch Screw [E], tighten it with the provided Allen Wrench [H].

8. Actuate the extended paddle to confirm the ambidextrous functionality is operating properly.

Important Notes

• The paddle and screw may need to be moved around slightly to seat the screw properly before tightening.
• Make sure the plunger goes in before the spring, with the thicker end of the plunger first.
• Traditional bolt catch hardware is not included unless supplied separately with your lower parts kit.

FCU Installation

1. Set the optional FCU O-Ring [F] in place.

2. Drop in the FCU. The FCU is not included with the grip.

3. Fix the FCU in place by installing the spear pin from left to right as shown in the original manual.

4. Slide the desired Dust Cover [B] on from the front until it aligns with the screw hole in the Grip Base [A].

5. Fasten the dust cover with the Dust Cover Screw [D].

Model Setups

O-Ring Notes

• The smaller FCU O-Ring [F] is made from high-temperature silicone and is intended to replicate the give of polymer grip modules where the FCU contacts.
• The larger black Grip Panel O-Rings [G] compress and add tension to the grip screws, helping keep them secure without threadlocker.
• The O-rings are designed to allow easier changes across grip extension options.

Assembly Steps

1. Insert the Safety Selector Cylinder [A] into the selector hole on the lower receiver, with the smooth end on the driver side and the grooved detent channel end on the passenger side.

2. Place the Long Selector Lever [B] onto the safety selector cylinder on the side of your dominant-hand thumb.

3. Align the tabs on the bottom of the lever with the slot on the end of the cylinder, then fasten them together using a Screw [D] and the provided Torx Wrench [E].

4. Turn the selector lever to SAFE and make sure it stays in position.

5. Drop the selector detent, pointed end first, into the selector detent hole above the grip fin on the passenger side of the lower receiver. It should sit completely below flush.

6. Place the selector spring into the hole on the top side of your grip.

7. Slide the grip with spring onto the lower receiver’s grip fin until it is completely flush, making sure the spring does not kink or bind as it enters the selector detent hole.

8. Maintain upward pressure on the grip and finish attaching it to the lower receiver by fastening the grip screw through the open bottom end of the grip.

9. Install the Short Selector Lever [C] on the remaining end, repeating the alignment and fastening steps. Make sure both levers point simultaneously toward either SAFE or FIRE.

10. With the assembly unloaded and cleared, function test the selector by switching from SAFE to FIRE and back a few times.

60/90 Degree Throw Adjustment

• To switch between 60-degree and 90-degree throws, loosen the grip screw just enough that the detent disengages.
• Rotate the assembly 180 degrees, then tighten the grip.
• Remove the levers one at a time, reorient them to face the opposite direction, and fasten them back into the selector assembly.
• If you shoot right-handed, place the longer lever on the driver side/smooth end of the cylinder, away from the passenger side/grooved end.