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AR-15 / M4
Stocks, grips, handguards, magazines and backup sights for the AR-15, M4 and M16. In stock now: buttstocks, magazine couplers, cheek rests & risers and foregrips. Every product lists exact compatibility, so you buy once and it fits.
New: the FAB Defense Ultimate AR-15 Upgrade Kit bundles a stock, grip, foregrip, flip-up sights and three mags in one box.
Shopping for your AR15, AR-15 or AR 15? Start with the parts you touch most: the stock, the pistol grip and the handguard. Every part lists whether it fits mil-spec or commercial buffer tubes, M-LOK or Picatinny, so you can buy once.
4 products
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FAB Defense Ultimate AR-15 Upgrade Kit (Stock, Grip, Foregrip, Sights & Mags)
FAB Defense
FAB Defense Ultimate AR-15 Upgrade Kit (Stock, Grip, Foregrip, Sights & Mags)
$280.95 -
FAB Defense FRBS Offset Folding Backup Sights for AR-15
FAB Defense
FAB Defense FRBS Offset Folding Backup Sights for AR-15
$91.50 -
FAB Defense FBS Front Backup Sight for AR-15
FAB Defense
FAB Defense FBS Front Backup Sight for AR-15
$34.45 -
FAB Defense RBS Rear Flip-Up Back-Up Sight
FAB Defense
FAB Defense RBS Rear Flip-Up Back-Up Sight
$52.35
AR-15 / M4 Questions
Will these stocks fit my AR-15 buffer tube?
Each stock lists whether it fits mil-spec, commercial or both. Many FAB Defense stocks, like the GL-CORE family, fit both.
What's the difference between M-LOK and Picatinny?
M-LOK accessories bolt straight into slots in the handguard. Picatinny is a rail with cross slots that clamp-on accessories grip. Our M-LOK vs Picatinny guide explains which to choose.
Do these parts fit an M4 or M16?
Yes. AR-15, M4 and M16 share the same furniture interfaces, and every product lists its exact fit.