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Rifle Parts

Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more. 

Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.

Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.

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  1. Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Out of stock
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  2. Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Out of stock
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  3. Aeroknox AX // Foregrip - M-LOK
    Aeroknox AX // Foregrip - M-LOK
    $50.00
    Out of stock
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  4. Midwest Industries Slim Line AR-15 M-Lok Handguard - 10.5"
    Midwest Industries Slim Line AR-15 M-Lok Handguard - 10.5"
    $162.95
    Out of stock
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  5. Maxim Defense MDX 505 PDX 300BLK Mil-Spec Complete Upper - 5.5" Urban Grey
    Maxim Defense MDX 505 PDX 300BLK Mil-Spec Complete Upper - 5.5" Urban Grey
    $1,165.50
    Out of stock
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  6. Maxim Defense MDX 505 PDX 7.62x39 Mil-Spec Complete Upper - 5.5" Urban Grey
    Maxim Defense MDX 505 PDX 7.62x39 Mil-Spec Complete Upper - 5.5" Urban Grey
    $1,165.50
    Out of stock
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  7. Maxim Defense MDX 505 PDX 5.56 NATO Mil-Spec Complete Upper - 5.5" Urban Grey
    Maxim Defense MDX 505 PDX 5.56 NATO Mil-Spec Complete Upper - 5.5" Urban Grey
    $1,165.50
    Out of stock
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  8. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
    Out of stock
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  9. A3 Tactical Mini Angled Foregrip - Polymer M-Lok
    A3 Tactical Mini Angled Foregrip - Polymer M-Lok
    $18.95
    Out of stock
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  10. A3 Tactical Large Angled Foregrip w/ Integrated Handstop - Polymer M-LOK
    A3 Tactical Large Angled Foregrip w/ Integrated Handstop - Polymer M-LOK
    $37.95
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  11. Sionics Weapon Systems (SWS) AR-15 Premium Complete 5.56 Upper Receiver - 16" (Phosphate BCG)
    Sionics Weapon Systems (SWS) AR-15 Premium Complete 5.56 Upper Receiver - 16" (Phosphate BCG)
    $789.95
    Out of stock
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  12. Battle Arms Development M-Lok Micro Handstop
    Battle Arms Development M-Lok Micro Handstop
    $14.99
    Out of stock
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  13. Ergo M-Lok Enhanced Angle Grip
    Ergo M-Lok Enhanced Angle Grip
    $40.00
    Out of stock
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  14. Ergo M-Lok Hand Stop / Barricade Stop - Black
    Ergo M-Lok Hand Stop / Barricade Stop - Black
    $40.00
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  15. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
    Out of stock
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  16. Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"
    Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"
    $712.50
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Items 1-16 of 60

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Barrel Length
  1. 5.5" 3 items
  2. 8.5" 2 items
  3. 10.3" 1 item
  4. 10.5" 1 item
  5. 13.7" 1 item
  6. 13.9" 1 item
  7. 14.5" 1 item
  8. 16" 2 items
  9. 18" 1 item
Caliber
  1. .223/5.56 1 item
  2. .30-30 1 item
  3. .308 1 item
  4. 300 Blackout 3 items
  5. 5.56 NATO 7 items
  6. 5.56mm 1 item
  7. 7.62x39 1 item
  8. 9mm 1 item
Category
  1. Receiver Parts 15 items
  2. Grips 14 items
  3. Rifle Handguards 31 items
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  1. M-LOK 2 items
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  2. Anodize 5 items
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  1. .750" 2 items
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  2. Mid 6 items
Inside Diameter
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  2. 1.42" 1 item
  3. 1.45" 1 item
  4. 1.55" 1 item
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  1. A3 Tactical 2 items
  2. Aeroknox 3 items
  3. Angstadt Arms 1 item
  4. Battle Arms Development 2 items
  5. Bravo Company MFG (BCM) 1 item
  6. Centurion Arms 1 item
  7. Cross Machine Tool (CMT) 4 items
  8. Daniel Defense 2 items
  9. Drew Meyers Defense 3 items
  10. Driven Arms Co. 1 item
  11. Ergo Grips 3 items
  12. Faxon Firearms 1 item
  13. Fortis MFG 2 items
  14. Foxtrot Mike 1 item
  15. Geissele 1 item
  16. Kinetic Development Group 2 items
  17. Knight’s Armament Company (KAC) 2 items
  18. Lewis Machine & Tool (LMT) 1 item
  19. Magpul Industries 2 items
  20. Matador Arms 1 item
  21. Maxim Defense 5 items
  22. Midwest Industries 7 items
  23. Next Level Armament 1 item
  24. Noveske 3 items
  25. Rainier Arms, LLC 1 item
  26. Sionics Weapon Systems 1 item
  27. SLR Rifleworks 1 item
  28. Sons of Liberty Gun Works 3 items
  29. V Seven Weapon Systems 1 item
  30. VLTOR 1 item
Model
  1. Sig MCX 1 item
Option
  1. AR-10 1 item
  2. AR-15 14 items
Platform
  1. AR-15 7 items
  2. AK47/74 1 item
  3. Sig Sauer 1 item
Price
  1. $0.00 - $999.99 51 items
  2. $1,000.00 and above 9 items
Product Type
  1. Accessory 1 item
  2. Angled Grip 3 items
  3. AR-10 Partial Upper Receiver 1 item
  4. AR-10 Handguard 1 item
  5. AR-15 Complete Upper Receiver 7 items
  6. AR-15 Partial Upper Receiver 4 items
  7. AR-15 Handguard 14 items
  8. AR-9 Upper Receiver 1 item
  9. Complete Upper 3 items
  10. Forearm Accesory 3 items
  11. Handguard 12 items
  12. Handstop 10 items
  13. Rail Section 1 item
  14. Sling Mount 1 item
  15. Vertical Grip 1 item
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5.5" 1 item
  4. 6.0" 2 items
  5. 6.7" 4 items
  6. 7" 1 item
  7. 8.25" 1 item
  8. 8.5" 1 item
  9. 9" 2 items
  10. 9.5" 6 items
  11. 9.6" 2 items
  12. 10" 1 item
  13. 10.5" 3 items
  14. 10.75" 1 item
  15. 12" 1 item
  16. 12.4" 2 items
  17. 12.5" 2 items
  18. 13" 5 items
  19. 13.5" 1 item
  20. 13.625" 1 item
  21. 13.7" 4 items
  22. 13.8" 2 items
  23. 14" 1 item
  24. 15" 11 items
  25. 15.3" 3 items
  26. 16" 1 item
  27. 16.5" 1 item
  28. 17" 1 item
  29. 18" 1 item
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 2 items
Thread Pitch
  1. 1/2x28 6 items
  2. 5/8x24 1 item
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:7 6 items
  2. 1:8 1 item
  3. 1:10 1 item
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  1. Out of stock 60 items Remove This Item
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