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Discussion Starter #1 (Edited)
HK MR556A1 upper with HK parts 10.5" barrel, vented gas block, Strike Industries Keymod rail and charging handle. Test fired and runs great suppressed or unsuppressed. -SOLD



HK MR556A1 upper with HK Quad rail (not the competition Hkey rail) Excellent condition SI charging handle SOLD
 

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Willing to sell HK parts barrel and gas block
 

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Discussion Starter #5
HK carrier groups/bolts/gas piston included with both.

I have a spare NIB HK parts 10.5 barrel/vented gas block/nut that I will be listing shortly.

Pms replied to.
 

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Discussion Starter #7
MR556A1 with HK parts barrel 10.5" is Sold Thx GCMKC

Standard MR556A1 upper 16" still available.
 

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Discussion Starter #8
MR556A1 upper SPF
 
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