Search
Dealer Locator
My Cart
Sign In
Menu

5.56 Nato Rifle Replacement Kits

5.56 NATO rifle replacement kits provide enthusiasts and professionals with convenient solutions for maintaining peak performance and reliability. Whether upgrading components or restoring functionality, these kits are designed to help keep your rifle in top condition. Explore a wide selection of options tailored to fit your needs, ensuring your equipment remains ready for any scenario. Find the right parts to support your shooting experience with quality and confidence from our collection of 5.56 NATO rifle replacement kits.

Read More

per page
  1. MCX-SPEAR LT 11.5 UPPER AR CONVERSION KIT 5.56 NATO-BLACK
    MCX-SPEAR LT 11.5 UPPER AR CONVERSION KIT 5.56 NATO-BLACK
    5
    (32)
    Out of stock
    Compare
  2. MCX-SPEAR LT AR CONVERSION KIT - 16" 5.56 NATO
    MCX-SPEAR LT AR CONVERSION KIT - 16" 5.56 NATO
    5
    (29)
    $2199.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  3. MCX-SPEAR LT 16" UPPER AR CONVERSION KIT 5.56 NATO-BLACK
    MCX-SPEAR LT 16" UPPER AR CONVERSION KIT 5.56 NATO-BLACK
    4
    (21)
    Out of stock
    Compare
  4. MCX-SPEAR LT 5.56 16" RIFLE
    MCX-SPEAR LT 5.56 16" RIFLE
    4
    (13)
    View Product
  5. SIG MCX-SPEAR LT 16" 5.56 NATO BARREL AND GAS BLOCK ASSEMBLY
    SIG MCX-SPEAR LT 16" 5.56 NATO BARREL AND GAS BLOCK ASSEMBLY
    5
    (7)
    $899.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  6. SIG MCX-SPEAR LT 11.5-INCH 5.56 NATO BARREL AND GAS BLOCK ASSEMBLY
    SIG MCX-SPEAR LT 11.5-INCH 5.56 NATO BARREL AND GAS BLOCK ASSEMBLY
    5
    (4)
    $899.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  7. SIG MCX BOLT ASSY, TAPERED LUG, 5.56/.300
    SIG MCX BOLT ASSY, TAPERED LUG, 5.56/.300
    5
    (4)
    $199.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  8. MCX-SPEAR LT IR 5.56 NATO 16"
    MCX-SPEAR LT IR 5.56 NATO 16"
    5
    (3)
    View Product
  9. SIG MCX-SPEAR LT 5.56/300BLK COMPLETE CARRIER GROUP
    SIG MCX-SPEAR LT 5.56/300BLK COMPLETE CARRIER GROUP
    5
    (3)
    Out of stock
    Compare
  10. MCX VIRTUS PISTON ASSEMBLY, 16IN BARREL - 5.56 NATO
    MCX VIRTUS PISTON ASSEMBLY, 16IN BARREL - 5.56 NATO
    3
    (2)
    $299.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  11. MCX VIRTUS PISTON ASSEMBLY, 14IN BARREL - 5.56 NATO
    MCX VIRTUS PISTON ASSEMBLY, 14IN BARREL - 5.56 NATO
    $299.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  12. SIG MCX-RATTLER LT 7.75-INCH 5.56 NATO BARREL AND GAS BLOCK ASSEMBLY
    SIG MCX-RATTLER LT 7.75-INCH 5.56 NATO BARREL AND GAS BLOCK ASSEMBLY
    $899.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  13. M400 5.56 BOLT ASSEMBLY KIT
    M400 5.56 BOLT ASSEMBLY KIT
    $179.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  14. TAPER CAP, 5.56 BARRELS, 1/2-28 THREAD
    TAPER CAP, 5.56 BARRELS, 1/2-28 THREAD
    4
    (72)
    $14.99
    View Product
  15. MCX-SPEAR LT 5.56 11.5" SBR
    MCX-SPEAR LT 5.56 11.5" SBR
    5
    (5)
    View Product
  16. 5.56 FLASH HIDER MUZZLE COMPENSATOR COMBO - BLACK
    5.56 FLASH HIDER MUZZLE COMPENSATOR COMBO - BLACK
    4
    (4)
    $79.99
    View Product
  17. SIG MCX-SPEAR LT 5.56/300BLK BOLT CARRIER ASSEMBLY
    SIG MCX-SPEAR LT 5.56/300BLK BOLT CARRIER ASSEMBLY
    4
    (3)
    $499.99
    FREE SHIPPING ON ORDERS OF $100+
    View Product
  18. MCX-SPEAR LT 5.56 11.5" PISTOL
    MCX-SPEAR LT 5.56 11.5" PISTOL
    5
    (2)
    View Product

Best Sellers

  1. CROSS RIFLE
    CROSS RIFLE
    View Product
  2. M400 TREAD 1.0
    M400 TREAD 1.0
    View Product
  3. 716i TREAD
    716i TREAD
    View Product

Related Pages

  1. 5.56 NATO Replacement Barrels
    5.56 NATO Replacement Barrels
    View Product
  2. 5.56 Nato Upper Bolt Kits
    5.56 Nato Upper Bolt Kits
    View Product
  3. Firearm Replacement Kits
    Firearm Replacement Kits
    View Product
Sign Up for News and Updates
InstagramYouTubeLinkedIn SIG SAUER Social
Also of Interest
© SIG SAUER 2025. All Rights Reserved.
Compare Products
Items
Launch Compare

Zip Code Verification

Some states have legal restrictions for the purchase of items so we need to ask for your location.

Age Verification

Some products have purchase restrictions for those under the age of 21, please verify your age.