LBE Unlimited Front Sight Taper Pins – AR-Platform, Black, 2-Pack
(Model ARTPS | UPC 706612408400)
Lock your front sight base in place the right way. The LBE Unlimited Front Sight Taper Pins are precision-ground, black-finished taper pins designed specifically for AR-platform gas blocks/front sight bases (FSB). Sold as a 2-pack, these pins deliver the secure, rock-solid retention that serious builders and armorers demand—ensuring your FSB stays perfectly indexed under recoil, heat, and hard use. Whether you’re completing an A2/A4 clone, servicing a duty rifle, or refreshing a training carbine, ARTPS provides dependable fit and long-term durability.
Unlike set-screw or clamp-on options that can shift, pinned FSBs are the gold standard for gas block security. With properly reamed holes and correctly oriented tapers, these pins resist movement through thousands of rounds, weather, and field abuse.
Why Choose LBE Unlimited ARTPS Taper Pins?
True Taper for True Security
Properly sized and tapered to match AR front sight base reamed holes, producing a wedge fit that locks the FSB to the barrel shoulder.
Precision Ground & Consistent
Tight tolerances promote repeatable alignment and even seating across both pin positions—critical for gas port alignment and front sight zero retention.
Rugged, Corrosion-Resistant Finish
Black-oxide style finish helps resist rust and blends with GI aesthetics for clone-correct builds.
2-Pack Convenience
Most A2/A4 FSBs use two taper pins—this kit covers a standard installation or provides spares for your armorer’s bench.
Builder-Ready
Ideal for new FSB installations, barrel swaps, or replacement of worn/damaged pins on service rifles.
Compatibility Note: Designed for AR-15/M16/M4 front sight bases that are pinned to the barrel. Requires a barrel and FSB that are pre-drilled & taper-reamed. Not for clamp-on or set-screw gas blocks.
Key Specifications
Brand / Model: LBE Unlimited ARTPS
UPC: 706612408400
Platform: AR-15/M16/M4 front sight base (FSB)
Type: Taper pins, front sight/gas block retention
Finish: Black (corrosion resistant)
Quantity: 2 pins per pack
Use Case: A2/A4 clone builds, duty carbines, service/repair, armorer spares
Performance Benefits You’ll Notice
Rock-Solid Gas Block Retention
Properly installed taper pins keep the FSB from twisting, walking, or creeping, preserving gas port alignment and reliable cycling.
Repeatable Zero
With the FSB locked down, your mechanical zero stays consistent—no wandering poi from minor bumps or heat cycles.
Duty-Grade Durability
Pins hold tight through recoil, hard sling use, and environmental stress—the standard for fielded military rifles.
Ideal Applications
Clone-Correct A2/A4 Builds: Authentic look and function with pinned FSB.
Duty & Training Carbines: Proven retention method for high round counts.
Armorer Maintenance: Replace bent or marred taper pins during FSB service.
Barrel Changes: Re-pin your FSB after a new barrel install (with proper tooling).
Installation Overview (High-Level)
Verify Clear: Ensure the firearm is unloaded; remove bolt carrier group and charging handle.
Support the FSB: Use a proper bench block that supports FSB ears without stressing the barrel.
Orientation Matters: Taper pins are typically installed small end to large end in a specific direction (commonly driven left-to-right out, right-to-left in when the muzzle faces away). Confirm the direction on your FSB.
Align & Seat: With the barrel’s gas port aligned to the FSB, start pins on the small end and drive them until fully seated and flush with the FSB contour.
Function Check: Verify gas port alignment, handguard/rail clearance, and front sight alignment before live fire.
Tools Needed: Quality roll-pin/flat punches, a taper pin starter, bench block, and a dead-blow or gunsmithing hammer. For new builds, a taper reamer matched to your pin spec is required. If you’re new to FSB pinning, consult a qualified armorer.
Care & Maintenance
Corrosion Control: Wipe pins with a lightly oiled cloth after wet weather or high-humidity storage.
Periodic Inspection: Check seating depth and look for movement after high round counts or heavy impacts.
Don’t Over-Drive: Pins should seat firmly without deforming the FSB ears—use proper support and incremental taps.
Frequently Asked Questions
Q: Will these fit any AR gas block?
A: They’re intended for pinned A-frame front sight bases on AR-pattern rifles. Low-profile gas blocks usually use set screws or different pin styles.
Q: Are the holes in my barrel/FSB already tapered?
A: Factory pinned barrels/FSBs are generally pre-reamed. For fresh installs, the builder must ream the FSB/barrel as a unit to match taper pin spec.
Q: What direction do the pins go?
A: Most mil-spec setups drive out left-to-right and install right-to-left (viewed from the shooter’s position), but confirm your specific FSB.
Q: Do I need thread locker?
A: No—taper retention is mechanical. Proper taper fit and seating provide the hold.
Q: Will these work on .308/large-frame ARs?
A: These are for AR-15 pattern FSBs. Large-frame platforms often use different gas block solutions.
SEO Highlights (Quick Scan)
LBE Unlimited Front Sight Taper Pins ARTPS – AR-platform FSB pins
Black, corrosion-resistant finish; 2-pack for standard installs
Ensures rock-solid gas block/front sight retention and repeatable zero
Ideal for A2/A4 clone builds, duty/training carbines, and armorer service
UPC 706612408400 – precision taper pins for AR-15/M16/M4 FSBs
The Bottom Line
When your build or repair calls for mil-spec front sight base security, choose the LBE Unlimited Front Sight Taper Pins (ARTPS). Precision taper, durable black finish, and a convenient 2-pack make them the dependable solution for locking down your FSB and keeping your rifle cycling and zeroed—shot after shot, season after season.
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