SUPERSLIM FREE FLOAT RAIL SYSTEM Item No.: MTU004SSK / MTU005SSK / MTU006SSK / MTU019SSK & All Color Variants Proudly Designed and Manufactured in USA 15" Single Rail, Super Slim, Free-floating Handguard with Keymod Compatible Attachment Slots and Proprietary Barrel Nut Design Fits Carbine Length, Mid-Length or Rifle Length AR15s Super Lightweight with Extended Top Rail to Form a Continuous Mounting Platform with SUPERSLIM FREE FLOAT the Receiver Includes 2 Keymod Compatible Picatinny Rail Sections, 4 Slot and 8 Slot, for Limitless Accessory Customization Options RAIL SYSTEM Features Integral Anti-rotation Tabs for Perfect Alignment and Rock-solid Locking with Upper Receiver Ergonomic Octagonal Profile with Well Placed Grooves on Rail Surface for Solid Grip and Item No.:
MUM044011405 Superior Handling Comfort Scalloped Top Picatinny Rail Edges for No-Snag Easy Accessory Mounting MTU004SSK / MTU005SSK / MTU006SSK / MTU019SSK Precision Machined from 6061-T6 Aircraft Grade Aluminum with Hard Coat Finish & All Color Variants Simple and User Friendly Installation with Easy to Follow Instructions Included Designed to Fit with Standard Gas Tube and Barrel Not Exceeding 1" in Diameter, Not Made in USA Compatible with Piston System, Re-designed or Over-sized Upper Receivers MODEL 4/15 RIFLE COMPONENT REFERENCE 3 4 UTG INNOVATIVE FREE FLOATING DESIGN AFTER INSTALLATION (Patent Pending)
Detachable Keymod Compatible Rail Sections Keymod Compatible Picatinny Rail Sections 5 6 MODEL 4/15 CARBINE-LENGTH APPLICATION MODEL 4/15 MID-LENGTH APPLICATION 42 Keymod Compatible Slots with 18 Slot Top Picatinny Rail, Complete with 63 Keymod Compatible Slots with 23 Slot Top Picatinny Rail, Complete with One 8-slot and One 4-slot Detachable Picatinny Rail Sections One 8-slot and One 4-slot Detachable Picatinny Rail Sections Fits Carbine-length AR-15 with Standard Gas Tube Fits Mid-length AR-15 with Standard Gas Tube Accommodates Low Profile Gas Block Accommodates Low Profile Gas Block 7.20” (183MM) 9.25” (235MM)
7” Free Float MTU005SSK 9” Free Float MTU004SSK Super Slim Rail Super Slim Rail PATENT PATENT PENDING PENDING 7 MODEL 4/15 8 MODEL 4/15 RIFLE-LENGTH APPLICATION EXTENDED RIFLE-LENGTH APPLICATION 91 Keymod Compatible Slots with 31 Slot Top Picatinny Rail, Complete with 112 Keymod Compatible Slots with 37 Slot Top Picatinny Rail, Complete with One 8-slot and One 4-slot Detachable Picatinny Rail Sections One 8-slot and One 4-slot Detachable Picatinny Rail Sections Fits Rifle-length AR-15 with Standard Gas Tube Fits Rifle-length AR-15 with Standard Gas Tube Accommodates Low Profile Gas Block Accommodates Low Profile Gas Block 12.52” (318MM) 15” (381MM)
MTU019SSK 13” Free Float MTU006SSK Super Slim Rail 15” Free Float PATENT Super Slim Rail PENDING PATENT PENDING 9 10 MODEL 4/15 SUPER SLIM FREE FLOAT Caution: Make sure firearm is not loaded. Remove magazine and 3.1 RAIL SYSTEM INSTALLATION GUIDE examine chamber. Use safe handling procedures at all times.
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1 2 3 BARREL BARREL 1. Super Slim Keymod Compatible Rail Set up a comfortable working environment. Remove the original plastic handguard using Remove the lower receiver with stock 2. Barrel Nut Lay out the rifle, handguard rail and all the the handguard removal tool. assembly. Remove the bolt assembly from the 3. Locking Ring included parts & tools. For proper installation upper receiver (3.1). 4. Barrel Nut Wrench of this product, you also need to prepare the 5. 3mm Allen Wrench following necessary tools: AR-15 combo 6. 3/32” Allen Wrench wrench, AR-15 handguard removal tool, a 7. Spacer - 4Pcs Note: Barrel Direction: Barrel (Pointing Left) or Barrel (Pointing Right) 8. 4-Slot Picatinny Rail Section (.38” Saddle Height) hammer, a punch, AR-15 upper receiver vise 9. 8-Slot Picatinny Rail Section (.38” Saddle Height) block, and a vise. 10. Barrel Nut Locking Screw - 7Pcs 11 12
5.1
4 5 6 7 BARREL BARREL BARREL Remove the flash hider by turning it Securely place the barrel on a well padded flat Clamp the upper receiver on a vise with an Remove all parts from the package. counterclockwise with an AR-15 combo surface. Using a hammer and punch, tap out AR-15 upper receiver vise block. Loosen the See Page 9 for Part Descriptions. wrench. the two pins at the bottom of the front sight. barrel nut by turning it counterclockwise with Remove the front sight/gas block, the gas an AR-15 barrel nut wrench. Remove the tube, and front handguard cap (5.1). original barrel nut and delta ring assembly. 13 INCORRECT CORRECT 14 (SPACERS REQUIRED) 10.1 Warning: Max. torque value for 9.1-1 9.1-2 10.1 installing barrel nut should not exceed 60 ft-lb.
2nd Slot
t-lb f 5
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Torque Wrench Spacer(s) 8 9 10 11 BARREL BARREL BARREL BARREL Carefully read the yellow warning sticker on THIS STEP IS VERY RARELY NEEDED Place the Barrel Nut Wrench in the second Use the Barrel Nut Wrench to securely tighten the Barrel Nut on which correct slot to use for If you cannot achieve the proper alignment slot (10.1) on the Barrel Nut (closer to the the Barrel Nut with enough tension (35 ft-lb.). installation before removing the sticker. Fit the (9.1-1), use included Spacer(s) to achieve receiver). NEVER USE THE FIRST SLOT TO (We recommend using a torque wrench to free floating Barrel Nut on the upper receiver proper alignment of the threaded holes TIGHTEN. achieve proper tension). and hand tighten. To test alignment, fit the on the handguard with the slots handguard over the barrel and place over the on the Barrel Nut (9.1-2). Warning: These steps need to be done gently. DO NOT tighten aggressively. Apply a Barrel Nut. Ensure the threaded holes on the smooth, steady pressure to fully secure the Barrel Nut. The teeth of the wrench must handguard align with the slots on the Barrel be FULLY SEATED into the 2nd slot on the Barrel Nut each time you release and apply Nut (9.1-2). If the alignment is correct then pressure again. move to step 10. 15 INCORRECT CORRECT 16
Installation of a low profile gas block If desired, apply a small amount of must occur before locking the Handguard locking compound to the screws prior 12.1 to the barrel nut. to tightening. 14.1
in-lb 5 2
12 13 14 15 BARREL BARREL BARREL BARREL Slide the Locking Ring into the Barrel Nut, Make sure none of the 6 threaded screw Carefully slide the handguard over the Barrel Once you achieve the proper alignment of making sure the alignment slot on the Locking holes on the Locking Ring are blocked by Nut/Locking Ring assembly. Make sure there the threaded holes on the Locking Ring to Ring (12.1) is vertical and facing upward. the Barrel Nut. If necessary, refer to step 9 to is a positive connection between the top rail of those on the handguard rail, use the 3mm install a spacer or tighten the barrel nut a little the handguard and the top rail of the receiver Allen Wrench and 6 of the Locking Screws to further to allow access to the 6 screw holes. (there should be NO gap here). If you lose the securely lock the handguard to the Barrel Nut/ MAKE SURE NOT TO EXCEED 60 ft-lb OF alignment of the Locking Ring, use your Allen Locking Ring assembly. TORQUE. wrench to re-align the threaded holes (14.1). • Apply (25 in-lb) torque to secure screws • 6 Screws: 2-left, 2-right, 2-bottom 17 18.1 18.2 18.3 18 Attaching 16.1 17.1 Picatinny Rail Sections
16 17 18 BARREL BARREL To install your detachable Keymod Compatible Hold the Keymod Nut in place (16.1) and Place the rail with the Keymod Nuts onto the Once the Keymod Nuts are in the slots, Picatinny Rail Sections or other Keymod loosen the screw by turning it counter- desired slots of the handguard rail, inserting carefully slide the Rail Section forward until it compatible accessories, please refer to the clockwise with the included 3/32” Allen the nuts through the larger opening of the fully seats into and engages the handguard, following steps. Wrench. Do not fully detach the Keymod Keymod Slots with the protruding feet of the with little to no gap between the Rail Section Screw from the Keymod Nut. nuts pointing toward the muzzle of the firearm and the handguard. (17.1). (18.1, 18.2, 18.3) NOTE: The Keymod Nut and Screw can be fully disassembled if needed. 19 20
If desired, apply a small amount of locking compound to the screws prior to tightening. 20.1
19 20 21 22 BARREL BARREL BARREL BARREL Once the Rail Section is seated properly, use Reinstall the front sight to the gas tube. Install the flash hider on the Barrel. Re-install the bolt assembly, the lower receiver the included 3/32” Allen Wrench to hand- Reinstall the two pins to lock the front sight and stock assembly. tighten the screws on top of the Picatinny Rail to the barrel (20.1). Section to lock it securely to the Keymod Compatible Handguard. Do not over-torque. 21 PRODUCT FEATURES 22
BARREL BARREL Integral Anti-rotation Tab for Top Rail Perfectly Level Rock-solid Locking with Flat Top Receiver BARREL BARREL Optional Step - Users may purchase Optional Step - Install high quality UTG additional Picatinny/Keymod rail sections for accessories on the free floating slim rails, customized accessory attachment. such as foregrips, bipods, flashlights, lasers, Low Profile dot sight, etc. Gas Block Using all appropriate safety procedures, your rifle is now ready for test firing. DETACHABLE RAILS FOR SEPARATE SALE 0.38” Saddle Height Keymod Compatible Picatinny Rail Sections Theirs Ours 4-Slot 8-Slot MTURS04S MTURS04M Ultra Slim-line Design for Comfort and Compatible with Low Profile Gas Block Weight Reduction