LBE Unlimited AR Front Sight Post – Includes Sight Post Spring & Spring Retainer
(Model ARPSR | UPC 706612408394)
Dial in a crisp, repeatable front sight zero on your AR-platform rifle. The LBE Unlimited AR Front Sight Post (ARPSR) is a complete front sight service kit that includes the front sight post, the sight post spring, and the spring retainer—everything you need to restore positive detents, precise elevation clicks, and reliable zero on A2/A4-style iron sights or GI-pattern front sight bases (FSB).
Whether you’re refreshing a clone build, replacing a worn post on a training carbine, or assembling a new upper with fixed irons, this kit delivers mil-spec fit, corrosion-resistant construction, and tool-friendly flats for easy adjustments using a standard A2 sight tool or the tip of a cartridge.
Why Choose the LBE Unlimited ARPSR Front Sight Kit?
Complete, Drop-In Kit
Includes the front sight post, spring, and spring retainer so you can restore positive detent clicks and elevation indexing in one go.
Mil-Spec Pattern, Wide Compatibility
Designed for AR-15/M16/M4 platforms with A2/A4-style front sight bases and most GI-pattern fixed front sights used on clone and duty builds.*
Clean, Repeatable Adjustments
Proper detent spring tension and a quality post deliver crisp, tactile clicks for fast elevation zeroing and re-confirmation.
Durable, Corrosion-Resistant Finish
Built to endure rain, sweat, carbon, and daily carry. The black finish blends with GI aesthetics for a clone-correct look.
Armorer-Ready Value
Keep a few on hand to service range rifles, loaners, and agency fleets—front sight posts are small parts with a big impact on zero confidence.
*Verify compatibility with your specific FSB or fixed front sight. Not intended for low-profile gas blocks without A2 posts or for flip-up sights that use proprietary posts.
Key Specifications
Brand/Model: LBE Unlimited ARPSR
UPC: 706612408394
Components: Front sight post, post spring, spring retainer
Platform: AR-15/M16/M4 with A2/A4-style fixed front sight base
Adjustments: Standard A2 four-notch style elevation clicks (tool or cartridge tip)
Finish: Black, corrosion-resistant
Use Cases: Zeroing, maintenance/repair, clone builds, armorer spares, training carbines
Benefits You’ll Notice
Positive Detent Clicks
Fresh spring tension and a properly spec’d retainer produce firm, audible clicks, eliminating spongy or drifting elevation settings.
Faster Zero, Better Holds
A true-to-spec post centers cleanly in the protective ears, simplifying mechanical zero and aiding precise holds at common distances.
Long-Term Reliability
Quality materials and finish help the post resist rust and peening, preserving sharp detent notches and smooth adjustment over time.
Ideal Applications
A2/A4 Clone Builds: Maintain authentic look and function with GI-style hardware.
Duty & Training Rifles: Dependable front sight elevation for backup or primary irons.
Armorer Refresh: Replace worn or bent posts and tired springs during routine service.
New Uppers with Fixed Irons: Complete your FSB setup with parts that just work.
Installation Overview (High-Level)
Verify Clear: Remove magazine; lock bolt to rear and confirm empty chamber.
Support the FSB: Secure the rifle so the front sight base is stable.
Remove Old Components: Depress the old post detent and rotate the post counter-clockwise to remove; retain or discard old spring/retainer as needed.
Install Spring & Retainer: Drop the spring and retainer into the detent channel.
Install New Post: Press down on the retainer with a sight tool and thread the new front sight post in clockwise, aligning to a starting height.
Function Check: Ensure distinct clicks and no binding; confirm the post sits square between protective ears.
Tools: A standard A2 front sight tool speeds the job; a cartridge tip works in a pinch. If the detent is damaged or seized, consult a qualified armorer.
Zeroing Tips
Mechanical Zero Start: Set rear sight to mechanical zero; adjust the front post for elevation (down = POI up, up = POI down).
Fine-Tune at Distance: Confirm at your preferred zero (e.g., 50/200 yards or 36 yards). Record number of clicks from flush for quick re-zeros after maintenance.
Protect the Post: Avoid over-torquing; use firm pressure just enough to click into place.
Care & Maintenance
Keep It Clean: Brush carbon from the FSB and post notches; a drop of light oil prevents corrosion.
Inspect Seasonally: Check for bent posts, weak detent tension, or rounded notches—replace as needed.
Paint for Contrast (Optional): Some users apply a thin coat of white or hi-vis paint to the post tip for faster sight pickup (remove oils first).
Frequently Asked Questions
Q: Will this work with flip-up front sights?
A: It’s designed for A2/A4 fixed front sight bases. Many flip-ups use proprietary posts—verify before ordering.
Q: Is the post square or round?
A: It follows the standard A2 four-notch style compatible with common sight tools.
Q: My clicks feel mushy—what’s wrong?
A: Typically a worn spring/retainer or fouling. Replacing both with this kit restores crisp detents.
Q: Does the kit change point of impact?
A: Any post height change will affect elevation. Re-zero after installation and record your settings.
Q: Stainless option?
A: This kit ships black finished for GI aesthetics and corrosion resistance.
SEO Highlights (Quick Scan)
LBE Unlimited AR Front Sight Post ARPSR – includes spring & spring retainer
Fits A2/A4-style AR-15/M16/M4 front sight base
Crisp elevation clicks, GI-pattern A2 four-notch post
Black, corrosion-resistant finish for clone-correct builds
Ideal for zeroing, repair, armorer spares, duty/training rifles
UPC 706612408394 – complete front sight service kit
The Bottom Line
For fast, repeatable elevation adjustments and a front sight you can trust, the LBE Unlimited AR Front Sight Post Kit (ARPSR) is the simple, complete fix. With the post, spring, and retainer included, you’ll restore crisp detents, lock in your zero, and keep your AR’s fixed irons performing at their best—range day after range day.
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