We have tried to answer the most common questions below. If after reading this section you still have questions please shoot us an email or contact us through our contact form.
Answers to Common Questions
Slim Series Mounting Instructions and Tips
Before mounting handguard ensure your receiver is mil-spec. If not, confirm fit of parts before beginning mounting instructions.
1 ) Remove the gas tube, old barrel nut and barrel. Thoroughly clean the upper receiver extension threads. Apply a very thin coating of mil spec grease to the clean receiver threads. (note: apply only a thin amount of grease and small drop of blue loctite if desired)
2 ) Insert the barrel into the upper receiver. Slide the UARs Slim Series barrel nut over the barrel. Thread onto the upper receiver threads and torque the barrel nut to 35 ft. lbs. Check gas tube alignment. If the gas tube channel does not align for the gas tube, then continue tightening the barrel nut until the next gas tube channel is aligned for the gas tube. Do not exceed a torque of 75 ft.lbs.
3 ) Once you have installed the gas tube and block, slide the handguard over the barrel and align the top rail with the receiver rail. Slide the handguard onto the barrel nut pushing firmly toward the receiver until it stops against the face of the receiver.
4 ) Alternately tighten the two 3/16 hex mounting bolts (with wrench provided) at the base of the handguard until a slightly snug fit is achieved. Confirm alignment of top rail with upper receiver, if needed remove handguard and adjust barrel nut for proper alignment. Once the handguard is properly aligned to the receiver and the bottom mounting hex bolts are slightly snugged, alternately tighten the four small 3/32 set screws (with second wrench provided) at the top and bottom of the handguard until snug. DO NOT over tighten. These set screws maintain alignment of the handguard while the bottom bolts are tightened, these set screws can also be used for minor adjustments to the alignment of the handguard in relation to the barrel. You will need to loosen the two mounting bolts slightly before making any further set screw adjustments, then re-tighten. DO NOT over tighten. Stripped screws are not covered by the warranty.
Original Series Handguard– The inside diameter and outside diameter for our handguards are the same on all our original series models. I.D. 1.750″ +/- .005″ and O.D. 2.000″ +/- .005″. Length depends on what you order. 7″, 9″, 12″,15″ are standard, but we can do custom lengths as well.
Slim Series Handguard– The inside diameter and outside diameter for our slim handguards are the same on all our slim models. I.D. 1.55″ +/- .005″ and O.D. 1.80″ +/- .005″. Under the top rail there is an additional 0.28″ x 0.5″ for the gas system. Length depends on what you order. 7.25″, 9″, 12″, and 15″. Custom lengths are not available.
Yes, all our handguards include a proprietary barrel nut mounting system. It is a two part system that allows the handguard to be timed.
Our stock handguards ship in Armor Black or Anodized Black (depending on availability, or Raw on request. We also offer all H-Series colors available through Cerakote for $35 each. Click on the images to view color samples or click on the following link: Cerakote
Unique-ARs guarantees that you will receive the highest quality Cerakote painted handguard. Below is about the time periods that you can expect until your items ship:
Armor Black or Raw: ships in 3 business days
Single color: ships in 5 business days
Two or more colors: ships in 2-4 weeks
For Custom and Private Label Anodizing please allow an additional 4-8 weeks after time of approval.
Raw or single color Cerakote Armor Black is included in the cost of the handguard(s). Anodized Black may affect production time and cost. There is a charge for Armor Black when in conjunction with any other color.
Each Cerakote color requires its own process, therefore we must charge for each color, including Armor Black when in conjunction with any other color.
Our handguards are constructed using 6061 t6 aluminum.
YES, if your AirSoft gun has a standard mill spec threaded upper, Which lots do. The standard is 1.250″ x 18 tpi and we also offer metric M31.8 x P1.5. If you have any questions please shoot us an email.
Yes, our handguards are drilled and tapped the full length on the top and bottom for our picatinny rails. Some designs are drilled and tapped at the 3 and 9 o’clock positions like the One Shot. For custom designs we can place tac rail holes anywhere you would like.
Heat Shields cover the entire barrel. The Heat Shield is made to slide under the handguard and over the 556 castle nut bolt, and be tightened down to barrel with the included end cap that will replace your muzzle break. End cap has a thread pitch of 1/2″ x 28. Check out the Heat Shield product description for information on compatible barrel lengths, gas tube pocket lengths and the installation video. **Coming soon! By popular demand we will offer an end cap that makes the Heat Shield compatible with the 300 Blackout Barrel.**
Short Shields only extend to the end of the handguard. The Short Shield is made to slide under the handguard and over the 556 castle nut bolt, and is attached using either a flat or spiked sprocket end cap. Sprocket end cap is attached with two screws inserted in the foremost tac rail holes at the 12 and 6 o’clock positions. Will not work with handguards that have an upgraded front end cut. I.D. of end cap is 0.800″. Check out the Short Shield product description for more information, gas tube lengths and the installation video.**Short shield only works with 556 barrel nut and 0.75″ gas blocks.**
Handguard length, length of gas tube, and color specification required for either Heat Shield or Short Shield.