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#dimensions #howwide 1st-gen 522 522 folding stock 551 551 handguard 551a1 552 552 clone 553 556 556 classic 556 er 556 sig polymer handguard hand guard 556 swat 556r 556xi 556xi russian 556xi trigger upgrades 55x 9mm ammo acog accuracy adapter advice bayonet bipod black adjustable folding stock bolt bushnell ar diopter sight fishgill fix accuracy 556 swat flash hide for sale galil gas block gas regulator gas tube hand guard handguard help hume's 556 inconsistent zero jmac customs keymod lower mag magazine release mcx mfi mfi diopter muzzle device parts parts kit patrol pistol piston quad rail question rail retainer cap scopes sg551 sg556 sig sig 551 sig 553 sig 556 sig 556 adjustable stock sig 556 classic sig 556 folding stock sig 556 handguard sig 556 parts sig 556r sig 556xi sig folding stock sig p556 sig sauer sig sauer 556 parts kit sig sauer556quadrail sig556 sig556 parts sig556xi silencer sold stock stock adapter sturmgewehr 90 suppresor suppressor surefire swat swiss swiss folding stock swiss stock top rail mounting screws troy wtb wts
  1. Uppers, Lowers, Barrels and Parts
    Hey everyone I have these parts for sale. Actual Swiss 552 handguard Jmac customs 552/556 HG Retainer Gas block with folding sight
    parts
  2. New Member Introductions
    My name is Rick, I am obvious a new dude to SIG 556 XI rifles. I have never joined a thread before and not super chatty, that aside I do like helping helpful people. I have put together several AR10 and custom .308 bolt guns. Is there anything I should know to watch out for. 2017 carbon 16"...
    discussion parts problems reloads upgrades
  3. 556 Discussions
    Can anyone sell me or direct me on where to buy the sig 556 (rifle or pistol) mag release. Per the sig schematic part number 502. It is not shaped like the standard AR mag release.
    buy parts sig556
  4. Buy Sell Trade (Non-FFL)
    I am looking for a factory complete Sig 556 Patrol parts kit as well as other spare parts for the rifle. I'm trying to get some spare parts together as I have really grown to like the gun. Please let me know what you have. Thanks
    556 bolt kit parts patrol sig spring
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