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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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Items 129-144 of 191

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  1. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    $950.00
    Out of stock
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  5. Sig Sauer TREAD Vertical M-LOK Grip Kit
    Sig Sauer TREAD Vertical M-LOK Grip Kit
    Special Price $37.99 Regular Price $49.99
    Out of stock
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  7. Aeroknox AX // Foregrip - M-LOK
    Aeroknox AX // Foregrip - M-LOK
    $50.00
    Out of stock
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  9. 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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  11. Battle Arms Development M-Lok Micro Handstop
    Battle Arms Development M-Lok Micro Handstop
    $14.99
    Out of stock
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  12. Ergo M-Lok Enhanced Angle Grip
    Ergo M-Lok Enhanced Angle Grip
    $40.00
    Out of stock
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  13. Ergo M-Lok Hand Stop / Barricade Stop - Black
    Ergo M-Lok Hand Stop / Barricade Stop - Black
    $40.00
    Out of stock
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  15. Next Level Armament NLX-HS M-LOK Handstop
    Next Level Armament NLX-HS M-LOK Handstop
    $29.00
    Out of stock
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  16. Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"
    Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"
    Special Price $400.00 Regular Price $500.00
    Out of stock
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Items 129-144 of 191

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  1. Mount M-LOK Remove This Item
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Barrel Length
  1. 5" 1 item
  2. 5.5" 2 items
  3. 7.5" 2 items
  4. 8" 1 item
  5. 10.5" 5 items
  6. 10.7" 1 item
  7. 11.5" 1 item
  8. 12.5" 1 item
  9. 13.7" 1 item
  10. 14.5" 3 items
  11. 16" 5 items
  12. 17" 1 item
  13. 18" 1 item
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. .22 ARC 1 item
  2. .30-30 1 item
  3. .308 1 item
  4. 300 Blackout 2 items
  5. 5.56 NATO 10 items
  6. 9mm 4 items
Category
  1. Receiver Parts 26 items
  2. Gas Systems 1 item
  3. Grips 58 items
  4. Rifle Handguards 104 items
  5. Stocks & Braces 3 items
Color
Configuration
  1. AR-15 3 items
  2. M-LOK 3 items
Finish
  1. Black 1 item
  2. Carbon Fiber 1 item
  3. Cerakote 1 item
  4. FDE 1 item
  5. Phosphate 1 item
  6. Anodize 13 items
Gas Block Diameter
  1. .750" 6 items
Gas System Length
  1. Carbine 3 items
  2. Mid 8 items
  3. Rifle 1 item
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.15" 1 item
  2. 1.3" 6 items
  3. 1.31" 1 item
  4. 1.315" 3 items
  5. 1.34" 3 items
  6. 1.39" 1 item
  7. 1.42" 1 item
  8. 1.45" 1 item
  9. 1.54" 1 item
  10. 1.55" 1 item
Manufacturer
  1. A3 Tactical 7 items
  2. Aero Precision 2 items
  3. Aeroknox 3 items
  4. Angstadt Arms 1 item
  5. Arisaka 3 items
  6. B5 Systems 3 items
  7. Battle Arms Development 2 items
  8. Bravo Company MFG (BCM) 12 items
  9. Brigand Arms 1 item
  10. Centurion Arms 1 item
  11. Chisel Machining 1 item
  12. Cobalt Kinetics 1 item
  13. Cross Machine Tool (CMT) 5 items
  14. Daniel Defense 3 items
  15. Drew Meyers Defense 5 items
  16. Driven Arms Co. 2 items
  17. Emissary Development 2 items
  18. Ergo Grips 3 items
  19. F-1 Firearms 1 item
  20. Faxon Firearms 1 item
  21. Fortis MFG 9 items
  22. Forward Controls Design 7 items
  23. Geissele 5 items
  24. Griffin Armament 2 items
  25. HERA ARMS 1 item
  26. Heresy Design 1 item
  27. Icon Defense 1 item
  28. JMAC Customs 12 items
  29. Kinetic Development Group 4 items
  30. Knight’s Armament Company (KAC) 2 items
  31. Kratos Design Group 2 items
  32. Lewis Machine & Tool (LMT) 5 items
  33. Magpul Industries 11 items
  34. Matador Arms 1 item
  35. Midwest Industries 12 items
  36. Next Level Armament 3 items
  37. Noveske 11 items
  38. Quarter Circle 10 2 items
  39. Rainier Arms, LLC 5 items
  40. Rainier Industries 2 items
  41. Rise Armament 2 items
  42. ROAM Rifles 4 items
  43. RS Regulate 1 item
  44. Sharps Bros 4 items
  45. Sig Sauer 1 item
  46. Sionics Weapon Systems 1 item
  47. SLR Rifleworks 2 items
  48. Sons of Liberty Gun Works 8 items
  49. Strike Industries 1 item
  50. True North Concepts 6 items
  51. Unity Tactical 1 item
  52. V Seven Weapon Systems 2 items
  53. VLTOR 1 item
Model
  1. CZ Scorpion 2 items
  2. Sig MCX 1 item
  3. Sig MPX 1 item
Option
  1. AK-47/74 1 item
  2. AR-10 1 item
  3. AR-15 39 items
  4. Long 1 item
  5. CZ 2 items
  6. Sig Sauer 1 item
  7. Green Laser 1 item
Platform
  1. AR-15 30 items
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  3. CZ 2 items
  4. H&K 1 item
  5. Sig Sauer 2 items
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  6. $500.00 - $599.99 5 items
  7. $600.00 - $699.99 2 items
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  9. $800.00 - $899.99 5 items
  10. $900.00 and above 4 items
Product Type
  1. Accessory 2 items
  2. Angled Grip 7 items
  3. AR-10 Handguard 1 item
  4. AR-15 Complete Upper Receiver 5 items
  5. AR-15 Partial Upper Receiver 14 items
  6. AR-15 Handguard 57 items
  7. AR-9 Upper Receiver 2 items
  8. Cable Clip 1 item
  9. Chassis 4 items
  10. Finger Stop 1 item
  11. Forearm Accesory 7 items
  12. Handguard 38 items
  13. Handstop 32 items
  14. Rail Adapter 1 item
  15. Rail Cover 1 item
  16. Rail Panel 2 items
  17. Rail Section 1 item
  18. Sling Mount 2 items
  19. Stock 2 items
  20. Stock Adapter 1 item
  21. Vertical Grip 19 items
Rail Length
  1. 3" 1 item
  2. 3.25" 1 item
  3. 4" 1 item
  4. 4.25" 3 items
  5. 4.5" 2 items
  6. 4.9" 1 item
  7. 5.5" 2 items
  8. 5.99" 1 item
  9. 6.0" 2 items
  10. 6.25" 2 items
  11. 6.375" 1 item
  12. 6.5" 2 items
  13. 6.7" 7 items
  14. 6.75" 2 items
  15. 7" 9 items
  16. 7.2" 2 items
  17. 7.25" 1 item
  18. 7.3" 1 item
  19. 7.5" 2 items
  20. 7.8" 1 item
  21. 8" 2 items
  22. 8.25" 1 item
  23. 8.6" 1 item
  24. 9" 7 items
  25. 9.15" 2 items
  26. 9.25" 1 item
  27. 9.3" 2 items
  28. 9.5" 13 items
  29. 9.55" 3 items
  30. 9.59" 1 item
  31. 9.6" 5 items
  32. 10" 7 items
  33. 10.3" 1 item
  34. 10.5" 9 items
  35. 10.64" 2 items
  36. 10.7" 3 items
  37. 10.75" 1 item
  38. 11" 2 items
  39. 11.1" 2 items
  40. 11.5" 4 items
  41. 11.7" 3 items
  42. 11.8" 4 items
  43. 12" 3 items
  44. 12.3" 1 item
  45. 12.4" 3 items
  46. 12.5" 8 items
  47. 13" 12 items
  48. 13.25" 1 item
  49. 13.5" 11 items
  50. 13.625" 1 item
  51. 13.7" 7 items
  52. 13.8" 5 items
  53. 14" 6 items
  54. 14.3" 1 item
  55. 15" 35 items
  56. 15.25" 1 item
  57. 15.3" 5 items
  58. 16" 1 item
  59. 16.3" 1 item
  60. 16.5" 3 items
  61. 17" 2 items
  62. 18" 1 item
Size
  1. 3 Slot 3 items
  2. 5 Slot 3 items
  3. 7 Slot 2 items
  4. 9 Slot 3 items
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 8 items
  3. 5/8x24 (.30 cal) 1 item
Threaded
  1. Yes 10 items
Twist Rate
  1. 1:7 9 items
  2. 1:8 1 item
  3. 1:10 1 item
Stock Status
  1. In stock 121 items
  2. Out of stock 70 items
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