Alex Pro Firearms AR-10 Bolt Carrier Group — .308 / 7.62 NATO | Black Nitride | RPUP800 | UPC 019962429125
Upgrade the heart of your large-frame AR with the Alex Pro Firearms AR-10 Bolt Carrier Group in .308/7.62 NATO. Finished in black nitride for low friction and exceptional corrosion resistance, this BCG is built to deliver smooth cycling, consistent lock-up, and reliable extraction under high round counts. Whether you’re assembling a new LR-308/AR-10-pattern rifle or refreshing a well-used workhorse, the RPUP800 BCG provides the durability and performance you can feel the moment you rack the charging handle.
Model / SKU: RPUP800
UPC: 019962429125
Compatibility: AR-10 / LR-308-pattern rifles (check receiver pattern and headspace before use; not for AR-15)
Why Choose the APF .308 / 7.62 AR-10 BCG
Black Nitride (QPQ) finish: A ultra-hard, low-friction surface helps reduce fouling adhesion, eases cleaning, and enhances wear resistance compared to standard phosphate.
Ready for round-count: Quality machining and heat treatment create dependable lug strength and cam path smoothness, supporting reliable lock-up and extraction over long strings.
Properly staked gas key: Robust staking helps keep the key tight under heat and recoil, preserving gas system integrity.
Drop-in upgrade for .308 ARs: Designed for .308 Win / 7.62 NATO AR-10/LR-308 builds (pattern-specific; see compatibility notes).
Built by Alex Pro Firearms: Backed by a U.S. manufacturer known for modern sporting rifle components and complete builds.
Key Features at a Glance
Platform: AR-10 / LR-308 pattern (not AR-15)
Caliber: .308 Winchester / 7.62×51 NATO
Finish: Black Nitride (QPQ) for wear, lubricity, and corrosion resistance
Gas Key: Installed and properly staked
Bolt / Carrier: Precision-machined, heat-treated steel components for reliable function and longevity
Extractor / Ejector: Tuned for positive extraction and consistent ejection with quality ammo
Model: RPUP800
UPC: 019962429125
Pattern / Fitment Note: The term “AR-10” covers multiple large-frame standards. This BCG is intended for AR-10/LR-308-pattern receivers. Confirm your upper/bolt/barrel extension compatibility (DPMS-pattern vs. other patterns) and always verify headspace before live fire.
Real-World Performance Benefits
Smoother cycling: Nitride’s slick surface reduces friction at contact points, promoting consistent carrier velocity and cleaner operation between maintenance intervals.
Enhanced durability: The finish hardens the surface for improved wear and corrosion resistance, ideal for mixed-environment shooting (dust, moisture, heat).
Reliability under heat: Proper gas-key torque and staking help maintain seal and timing during high-volume sessions or suppressed use (when configured/legal).
Ideal Use Cases
New large-frame builds: Pair with a quality .308/7.62 NATO barrel and appropriate buffer system for a dependable foundation.
Refresh/retrofit: Restore cycling reliability and extraction on older LR-308 rifles with a drop-in BCG solution.
Precision & hunting rigs: Consistent lock-up contributes to repeatable POI, supporting sub-MOA goals with quality ammo and barrels.
Best-Practice Setup & Tuning
Confirm pattern & headspace: Match the BCG to your receiver/barrel extension standard and check headspace with proper gauges.
Use the right buffer system: AR-10/LR-308 rifles vary—ensure buffer, spring, and receiver extension are correct for your specific configuration.
Lube generously: Even with nitride, initial break-in benefits from a light, quality oil on rails, cam pin, and bolt lugs.
Gas tuning (if applicable): Adjustable gas blocks and correct port sizing optimize recoil impulse—especially with suppressors or varying ammo.
Function test: Perform single-round lock-back checks, then progress to multi-round strings to confirm reliable feed, fire, extract, and eject.
Specifications (Quick Reference)
Type: Complete Bolt Carrier Group for AR-10 / LR-308
Caliber: .308 Win / 7.62 NATO
Finish: Black Nitride (QPQ)
Gas System: Key installed and properly staked
Compat: AR-10/LR-308 pattern uppers (pattern-check required)
SKU: RPUP800
UPC: 019962429125
Compatibility & Safety
Pattern differences: Many large-frame receivers/barrels are DPMS-pattern (often called LR-308). Armalite AR-10 and other proprietary patterns can differ in geometry. Confirm before purchase.
Headspace: Always check headspace with your barrel using GO/NO-GO gauges. If unsure, consult a qualified gunsmith.
Ammo: Use quality, in-spec .308 Win or 7.62×51 NATO ammunition. Avoid remanufactured or over-pressure loads not rated for your barrel.
Care & Maintenance
Clean smarter: Nitride sheds carbon more easily—wipe bolt tail, locking lugs, and carrier rails; keep the gas key and extractor channels serviceable.
Inspect wear points: Monitor lugs, cam pin, extractor spring/insert, ejector spring, and gas-key screws. Replace springs and small parts at sensible intervals.
Lubrication: Maintain a thin, even film on rails, bolt exterior, cam pin, and rings—especially for high-volume or high-heat sessions.
Frequently Asked Questions
Q: Will this BCG fit my AR-15 upper?
A: No. This is a large-frame BCG for .308/7.62 NATO AR-10/LR-308-pattern rifles. AR-15 uppers require AR-15-specific BCGs.
Q: Is it DPMS Gen 1 or other pattern?
A: It’s designed for AR-10/LR-308-pattern receivers. Because receiver/barrel specs vary by brand, verify your pattern and check headspace before use.
Q: Do I need to stake the gas key?
A: The gas key is properly staked from the factory. Verify torque during routine inspections.
Q: Can I use this with a suppressor?
A: Yes, when legal and appropriately configured. You may benefit from adjustable gas and correct buffer weights to manage backpressure.
Q: What ammo is recommended?
A: Quality, factory .308 Win or 7.62 NATO that matches your barrel’s chambering. Test for reliable lock-back and ejection patterns.
SEO-Friendly Highlights (Naturally Woven)
Alex Pro Firearms AR-10 Bolt Carrier Group, .308/7.62 NATO, black nitride BCG, staked gas key, reliable extraction and cycling, LR-308/AR-10 pattern compatible, upgrade BCG for large-frame builds, RPUP800, UPC 019962429125.
Meta for Your Product Page
Meta Title: Alex Pro Firearms AR-10 .308 BCG — Black Nitride | RPUP800
Meta Description: Boost reliability with the APF AR-10 Bolt Carrier Group in .308/7.62 NATO. Black nitride finish, staked gas key, AR-10/LR-308 pattern compatible. SKU RPUP800 — UPC 019962429125.
Give your large-frame AR the smooth cycling, durability, and easy maintenance it deserves with the Alex Pro Firearms AR-10 .308 Black Nitride BCG (RPUP800)—the drop-in upgrade that keeps your rifle running strong.
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