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raineirarms

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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Items 33-48 of 133

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  1. Daniel Defense RIS II M4A1 AR15 Handguard - 12.25" FDE
    Daniel Defense RIS II M4A1 AR15 Handguard - 12.25" FDE
    $501.00
    Out of stock
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  2. Aero Precision AR-15 M4E1 Stripped Lower Receiver - FDE
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - FDE
    $159.99
    Out of stock
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  3. Aeroknox Butterfly Brake .223/5.56
    Aeroknox Butterfly Brake .223/5.56
    $90.00
    Out of stock
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  4. Aeroknox Field Pins
    Aeroknox Field Pins
    $37.00
    Out of stock
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  5. Aero Precision AR15 Stripped Lower Receiver Gen 2 - FDE
    Aero Precision AR15 Stripped Lower Receiver Gen 2 - FDE
    $139.99
    Out of stock
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  7. Geissele MK14 AR-15 Super Modular Rail
    Geissele MK14 AR-15 Super Modular Rail
    Out of stock
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  8. Arms Republic RS AR-15 M-LOK Handguard
    Arms Republic RS AR-15 M-LOK Handguard
    Out of stock
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  10. Aeroknox AX // 15 Handguard M-LOK
    Aeroknox AX // 15 Handguard M-LOK
    Out of stock
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  13. Angstadt Arms Ultralight M-LOK Handguard
    Angstadt Arms Ultralight M-LOK Handguard
    Out of stock
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  16. Troy Industries Ambidextrous Magazine Release
    Troy Industries Ambidextrous Magazine Release
    $58.00
    Out of stock
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Items 33-48 of 133

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  1. Option AR-15 Remove This Item
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Barrel Length
  1. 8.5" 1 item
  2. 10.3" 1 item
  3. 16" 7 items
  4. 16.1" 1 item
  5. 18" 5 items
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. .223/5.56 2 items
  2. .223 Wylde 1 item
  3. .45 ACP 1 item
  4. 5.56 NATO 4 items
  5. 7.62x51 1 item
Category
  1. Receiver Parts 49 items
  2. Parts & Kits 17 items
  3. Buffer Systems 6 items
  4. Trigger Parts 6 items
  5. Gas Systems 1 item
  6. Muzzle Devices 3 items
  7. Bolt Parts 9 items
  8. Grips 1 item
  9. Charging Handles 7 items
  10. Rifle Handguards 29 items
  11. Stocks & Braces 3 items
Color
Configuration
  1. AR-15 7 items
  2. M-LOK 2 items
Finish
  1. Arid 1 item
  2. Black 2 items
  3. Cerakote 1 item
  4. Chrome 1 item
  5. FDE 1 item
  6. Nitride 1 item
  7. Phosphate 1 item
  8. Anodize 15 items
Gas System Length
  1. Mid 8 items
  2. Intermediate 5 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.35" 1 item
  4. 1.4" 1 item
  5. 1.42" 1 item
Is Firearms?
  1. No 133 items
Manufacturer
  1. Aero Precision 20 items
  2. Aeroknox 3 items
  3. Angstadt Arms 1 item
  4. Armaspec 1 item
  5. Arms Republic 1 item
  6. Ballistic Advantage 5 items
  7. Battle Arms Development 7 items
  8. Blackout Defense 5 items
  9. Blitzkrieg Components 2 items
  10. Bootleg 1 item
  11. Bravo Company MFG (BCM) 7 items
  12. Centurion Arms 2 items
  13. Cross Machine Tool (CMT) 5 items
  14. Daniel Defense 2 items
  15. Elftmann Tactical 1 item
  16. Faxon Firearms 3 items
  17. Fortis MFG 3 items
  18. Forward Controls Design 2 items
  19. Geissele 7 items
  20. HERA ARMS 3 items
  21. James Madison Tactical (JMT) 1 item
  22. JP Enterprises Inc 3 items
  23. Knight’s Armament Company (KAC) 2 items
  24. KNS Precision 3 items
  25. Lantac 3 items
  26. Lewis Machine & Tool (LMT) 1 item
  27. Magpul Industries 1 item
  28. Maxim Defense 2 items
  29. Midwest Industries 1 item
  30. NEMO Arms 1 item
  31. Next Level Armament 2 items
  32. Noveske 1 item
  33. Primary Weapon Systems 3 items
  34. Radian Weapons 2 items
  35. Rainier Arms, LLC 3 items
  36. Sharps Bros 1 item
  37. Silencerco 2 items
  38. Sionics Weapon Systems 3 items
  39. Sons of Liberty Gun Works 1 item
  40. Troy Industries 1 item
  41. Tyrant Designs 1 item
  42. V Seven Weapon Systems 3 items
  43. VLTOR 4 items
  44. WMD Guns 4 items
Mount
  1. KeyMod 7 items
  2. M-LOK 19 items
  3. Picatinny 7 items
Platform
  1. AR-15 7 items
Price
  1. $0.00 - $999.99 129 items
  2. $1,000.00 and above 4 items
Product Type
  1. Anti Walk Pins 2 items
  2. AR-10 Handguard 1 item
  3. AR-15 Assembled Upper Receiver 2 items
  4. AR-15 Charging Handle 7 items
  5. AR-15 Complete Lower Receiver 7 items
  6. AR-15 Complete Upper Receiver 4 items
  7. AR-15 Partial Upper Receiver 1 item
  8. AR-15 Handguard 26 items
  9. AR-15 Receiver Set 5 items
  10. AR-15 Stripped Lower Receiver 14 items
  11. AR-15 Stripped Upper Receiver 14 items
  12. Bolt 1 item
  13. Bolt Carrier Group 7 items
  14. Bolt Catch 1 item
  15. Brace 1 item
  16. Buffer Kit 4 items
  17. Buffer Tube 2 items
  18. Builders Kit 1 item
  19. Charging Handle 1 item
  20. Flash Hider 2 items
  21. Forearm Accesory 1 item
  22. Grip Module 1 item
  23. Handguard 4 items
  24. Lower Parts Kit 5 items
  25. Muzzle Brake 1 item
  26. Patch 1 item
  27. Safety Selector 2 items
  28. Sight Post 2 items
  29. Stock Adapter 2 items
  30. Take Down / Pivot Pins 4 items
  31. Trigger 4 items
  32. Trigger Guard 1 item
  33. Upper Parts Kit 1 item
Rail Length
  1. 4" 1 item
  2. 5.5" 1 item
  3. 6.7" 4 items
  4. 7" 6 items
  5. 9" 4 items
  6. 9.25" 1 item
  7. 9.3" 1 item
  8. 9.5" 3 items
  9. 9.6" 2 items
  10. 10" 7 items
  11. 10.25" 1 item
  12. 10.5" 3 items
  13. 11" 1 item
  14. 12" 9 items
  15. 12.25" 1 item
  16. 12.4" 2 items
  17. 12.5" 1 item
  18. 13" 5 items
  19. 13.5" 3 items
  20. 13.7" 4 items
  21. 13.8" 2 items
  22. 14" 1 item
  23. 15" 19 items
  24. 15.3" 2 items
  25. 17" 1 item
Size
  1. 9 Slot 10 items
Thread Pitch
  1. 1/2x28 (.22 cal) 2 items
Stock Status
  1. Out of stock 133 items Remove This Item
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