HK MR556 A4 AR-15 16.5" .223 / 5.56 Assembled Upper Receiver w/ Free-Float M-LOK Handguard

Name: HK MR556 A4 AR-15 16.5" .223 / 5.56 Assembled Upper Receiver w/ Free-Float M-LOK Handguard
Brand: GunMag Warehouse
Price: 2179.99 USD
Availability: InStock

Sold byGunMag Warehouse•Posted Apr 27, 2026

$2,179.99

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Deal Summary

Currently in stock.
Caliber: 223/5.56
Category: parts
SKU: 51000384
Brand: Heckler & Koch Magazines

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Deal Details

HK MR556 A4 AR-15 16.5" .223 / 5.56 Assembled Upper Receiver w/ Free-Float M-LOK Handguard