Triangle Handguard Cap


The Triangle Handguard Cap is available with different internal diameters and work with most two piece drop in rails or handguards.



Triangle Handguard Cap

The Triangle Handguard Cap is available from Frontier Tactical with different internal diameters.  They work with most two piece drop in rails or handguards.  We know how difficult it can be to find parts that are outside the standard AR-15 parts offered in the market.  Our goal is to stock parts that allow our customers to customize their own builds beyond what is basically offered on the market.

The Triangle Handguard Cap is available in .625″, .750″, .875″ or .937″ (5/8″, 3/4″, 7/8″, or 15/16″) I.D.  Made in the U.S.A.

We personally believe that by manufacturing high quality products any need for guarantees or warranties become largely unnecessary. It is our intent to prove that we appreciate your investment in our product. To that end, we diligently strive to provide you with solid value for your trust in us at Frontier Tactical™.

The Triangle Handguard Cap has been designed to accept most commonly available rail systems and hand-guard assemblies. It is made from high strength spring steel for durability and lighter overall weight.

AR-15 Complete Upper Receiver - FT

At Frontier Tactical™ we are committed to delivering the highest quality AR and tactical product innovations to you. We pledge to develop and manufacture only technologically superior solutions and promise to pioneer the evolution of firearms for generations to come.

Our mission is to provide our customers with products like no others on the market. Our goal is to forge original solutions to obstacles defined by our customers through the masterful use of technology, innovation and superior skill. We empower our customers, employees, vendors and peers through knowledge, communication and the spirit of ethical cooperation.


Additional information

Weight 0.5 lbs
Dimensions 3 × 3 × 3 in
Inside Diameter

I.D. .625", I.D. .750", I.D. .875", I.D. .937"

Specifications & Notices

Fits – Mil-spec AR-15 barrels. Material – Aluminum. Finish – Black Matte.

Weight: 2 oz. Length: 0.70” Width: 1.85”

Includes one Triangle Handguard Cap.

The Triangle Handguard Cap is manufactured in the U.S.A. Frontier Tactical™ is veteran owned and operated in the U.S.A.

Special Notice!

Any changes made to your AR-15 require your knowledge, understanding and compliance with BATFE regulations and local/State/Federal laws. It is the purchaser/owner’s legal responsibility to comply with these laws/regulations.

Specifically, the creation of a Short Barreled Rifle (SBR), Short Barreled Shotguns (SBS), suppressed barrels, or Any Other Weapon (AOW) requires compliance with the National Firearms Act of 1934 (NFA). All NFA rules apply to these modifications. Do not assume anything. Do not break the law.

Frontier Tactical™ LLC and its employees and agents are not liable and will be held harmless from and against all liabilities, legal fees, imprisonment, damages, losses, costs, and other expenses resulting from the illegal use by any purchaser, installer or operator of a firearm with our products.


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