The AR-15 Round Handguard Cap BL-19 (UPC: 859819007751) is a simple but essential small part for anyone building, restoring, or upgrading a classic AR-15 with standard round handguards. Designed by Luth-AR as a factory-style replacement, this steel handguard end cap helps properly locate and support your round two-piece handguards while giving the front of your rifle a clean, finished look.
Whether you’re piecing together a duty-style carbine, recreating a classic AR configuration, or replacing worn original parts, this BL-19 round handguard cap is a low-cost, high-value component that keeps your build solid and rattle-free.
Factory-Style Luth-AR Replacement Part
This AR-15 Round Handguard Cap BL-19 is a Luth-AR factory replacement, built to match standard specs for mil-style AR-15 rifles.
Key points:
Using a factory-spec replacement ensures proper fitment with standard round handguards, front sight bases, and AR-15 barrel assemblies.
Durable Steel Construction with Black Finish
Built to live at the front end of your rifle, this handguard cap is made from strong steel and finished in black to blend with most barrels, gas blocks, and front sight bases.
Material: Steel for durability and long service life
Color: Black, matches typical AR barrels and hardware
Resists deformation when properly installed between the front sight base/gas block and handguards
Steel construction means the cap maintains its shape, helping your handguards stay correctly seated even when the rifle sees hard use.
Designed for Standard Round AR-15 Handguards
The BL-19 is specifically built for round AR-15 handguards, not M4 or triangle-profile caps.
Perfect for classic rifle and carbine builds that use round two-piece polymer handguards
Helps index and support the front of the handguards at the gas block/front sight base
Keeps the handguards from shifting or rattling under recoil or sling pressure
If you’re switching from free-float to classic round handguards or replacing a damaged cap, this part is exactly what you need at the front of the handguard system.
Clean, Finished Front-End Look
While it’s a small part, the round handguard cap makes a big difference in the rifle’s appearance and feel:
Closes the gap between the handguards and front sight base/gas block
Gives the rifle a finished, professional look
Helps maintain that classic AR-15 silhouette many shooters love
Builders who want their rifle to look “right” from muzzle to stock will appreciate this simple upgrade.
Lightweight, Compact & Easy to Keep on Hand
Multiple retailers list this part at around 0.10 lb (≈1.6 oz) or less, making it a very lightweight piece of hardware.
Because it’s small and inexpensive, it’s smart to:
Keep a spare in your parts bin for future builds
Replace bent, rusted, or missing handguard caps on older rifles
Use it while experimenting with different round handguards on the same barrel assembly
It’s the kind of part you’re glad you have when a project is almost done and you realize the original cap is damaged or missing.
Compatible with Standard AR-15 Platforms
This AR-15 Round Handguard Cap is built around standard AR specs and is listed universally as an AR-15 make/model part.
Ideal for:
AR-15 rifle and carbine builds using round two-piece handguards
OEM-style front sight base/gas block setups
Traditional non–free-float handguard systems
Just ensure your barrel, gas block, and handguard configuration are compatible with round, circular handguard caps rather than triangular or M4-style caps.
Key Features – AR-15 Round Handguard Cap BL-19
From multiple manufacturer and dealer listings:
Product: AR-15 Round Handguard Cap
Manufacturer: Luth-AR LLC
Manufacturer Part Number (MPN): BL-19
UPC: 859819007751
Platform: AR-15
Material: Steel
Color: Black
Style: Round / circular handguard cap
Use: Front end cap for standard round two-piece AR-15 handguards
Perfect For Builders, Upgraders, and Armorers
The AR-15 Round Handguard Cap BL-19 is a smart pick if you:
Are building a classic AR-15 and want proper support for round handguards
Need to replace a missing or damaged handguard cap on a factory rifle
Prefer the look and feel of traditional round handguards instead of modern free-float rails
Maintain multiple rifles and like to keep OEM replacement parts on hand
It’s a small, inexpensive component that plays a big role in how your handguards fit, feel, and function.
Why Choose the AR-15 Round Handguard Cap BL-19?
Among various end caps and front hardware, the BL-19 Round Handguard Cap stands out because it offers:
Factory Luth-AR quality and specifications
Steel construction for reliability and long-term durability
A universal, black-finished look that works with most AR builds
Compatibility with standard AR-15 round handguards for that classic look and feel
If you’re finishing an AR build or restoring a rifle to its original configuration, the AR-15 Round Handguard Cap BL-19 (UPC 859819007751) is the right part to button up the front end cleanly and correctly.
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