It matches any of the Sharps Bros. lower receivers perfectly, and it also matches the lines of their handguards perfectly as well. This receiver is meant for .223, 5.56, 300 BLK and 6.5 Grendel calibers. Port opening is not large enough for 450 Bushmaster, 458 SOCOM or 50 Beowulf.
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HK 51000384 UPPER RECEIVER KIT MR556A4 16.5″
$2,179.00
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