AR-15 Triangular Handguard Cap
The Luth-AR Triangular Handguard Cap comes in .750″ and .625″ diameter to fit your AR-15 barrel. This handguard cap works great for rifle length builds, as well as retro builds. If you’re going with a retro build and a pencil profile barrel to get as close to the M16A1 as possible, be sure to select the .625″ version. This stamped steel endcap works for a wide variety of rifles and drop-in handguards, and it’s made in the USA by Luth-AR.
How Do I Install This Cap?
Handguard caps of any type won’t drop in easily on an already built rifle. If your AR-15 has an A1 or A2 style front sight base, you’ll need to remove the taper pins of the front sight base, along with the muzzle device to install this part. You’ll need a front sight bench block, as well as a good set of punches at minimum.
Which Size Fits My Barrel?
This depends on what diameter barrel you own or plan to purchase. A1 “Pencil” barrels are .625″ as most barrels on the market are .750″. We recommend referencing to the manufacturer specifications to get the best answer on what diameter your barrel is.
Specifications
- Fit: AR-15
- Material: Steel
- Finish: Phosphate
- Weight: 0.3 oz
- Made in USA














