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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. 556 Discussions
    This is my review of the MFI diopter sight/rail for the Sig 556. Disclosure: MFI gives a small cash payment for posting a review on a major forum, in this case $25. This did not influence my impression at all, and I intended to post a review before I found this out. I admit to a previous bias...
    diopter sight mfi mfi diopter
  2. Optics, Mounts, and Sights
    Hello all, I picked up my 551-A1 in 2014 and I just recently have started to add some upgrades to it. I wanted to add a bipod set up for a steady aim and really like the VersaPod line. The bipod attaches directly to the bayonet lug, or the picatinny rail. This particular bipod is NOT sold with...
    551a1 556 55x adapter bipod mfi
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