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Parts & Kits

At Rainier Arms product selection you can find various rifle parts and kits that will help you build and maintain your firearms. Our selection of rifle parts and kits is carefully curated to ensure that we offer only the best products available.

We work with leading manufacturers on the market including V Seven Weapon Systems, Battle Arms Development, Strike Industries, and more.

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287 Items

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  1. Strike Industries AR MAGSTOP
    Strike Industries AR MAGSTOP
    $8.95
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  2. Forward Controls Design AR-15 ABC/R Augmented Bolt Catch/Release Non-Offset Upper Paddle - Dimpled
    Forward Controls Design AR-15 ABC/R Augmented Bolt Catch/Release Non-Offset Upper Paddle - Dimpled
    $58.90
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  3. Forward Controls Design AR-15 ABC/R Augmented Bolt Catch/Release Rearward Biased Upper Paddle - Dimpled
    Forward Controls Design AR-15 ABC/R Augmented Bolt Catch/Release Rearward Biased Upper Paddle - Dimpled
    $58.90
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  4. Tactical Springs (Sprinco) M4 Carbine Buffer Spring
    Tactical Springs (Sprinco) M4 Carbine Buffer Spring
    $19.95
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  5. Tactical Springs (Sprinco) .308 Carbine Extra Power Buffer Spring - Orange
    Tactical Springs (Sprinco) .308 Carbine Extra Power Buffer Spring - Orange
    $19.95
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  6. Tactical Springs (Sprinco) M16/AR15 Rifle Length Standard Power Buffer Spring - Green
    Tactical Springs (Sprinco) M16/AR15 Rifle Length Standard Power Buffer Spring - Green
    $19.95
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  7. B5 Systems Steel End Plate - Black
    B5 Systems Steel End Plate - Black
    $19.00
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  8. Triggertech AR 45/90 Degree Safety Selector
    Triggertech AR 45/90 Degree Safety Selector
    $57.99
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  9. Sharps Bros AR-15 Lower Parts Kit W/O Fire Control Group & Grip
    Sharps Bros AR-15 Lower Parts Kit W/O Fire Control Group & Grip
    $34.99
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  10. Forward Controls Design Ambidextrous 90 Degree Safety Selector - Standard/Short Q Levers
    Forward Controls Design Ambidextrous 90 Degree Safety Selector - Standard/Short Q Levers
    $78.85
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  11. Forward Controls Design Ambidextrous 50 Degree Safety Selector - Standard/Short Q Levers
    Forward Controls Design Ambidextrous 50 Degree Safety Selector - Standard/Short Q Levers
    $78.85
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  12. Strike Industries AR-15 Modular Bolt Catch
    Strike Industries AR-15 Modular Bolt Catch
    $32.95
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  13. KNS Precision Turned Lower Parts Kit - AR-15
    KNS Precision Turned Lower Parts Kit - AR-15
    $20.00
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  14. Griffin Armament GAS Ambi Safety Selector Kit
    Griffin Armament GAS Ambi Safety Selector Kit
    $38.00
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  15. Strike Industries Ultralight Multi-Function End Plate & Anti-Rotation Castle Nut
    Strike Industries Ultralight Multi-Function End Plate & Anti-Rotation Castle Nut
    $35.95
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  16. Strike Industries AR Enhanced Castle Nut & Extended End Plate V2
    Strike Industries AR Enhanced Castle Nut & Extended End Plate V2
    $57.95
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287 Items

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Shop By
Shopping Options
Category
  1. Forward Assist 12 item
  2. Lower Parts Kit 30 item
  3. Other Rifle Parts 143 item
  4. Port Cover | Rod | Springs 23 item
  5. Safety Selectors 54 item
  6. Take Down & Pivot Pins 22 item
  7. Upper Parts Kit 3 item
Price
  1. Less than $10 19 item
  2. $10 to $25 63 item
  3. $25 to $50 102 item
  4. $50 to $100 81 item
  5. $100 to $250 10 item
  6. $250 to $500 2 item
  7. $500 to $1000 4 item
  8. Greater than $1000 2 item
Manufacturer
  1. ALG Defense 1 item
  2. Aero Precision 6 item
  3. Aeroknox 1 item
  4. Angstadt Arms 1 item
  5. Apex Tactical Specialties 4 item
  6. Armaspec 5 item
  7. Arms Republic 1 item
  8. Ascalon Arms 6 item
  9. B5 Systems 1 item
  10. Battle Arms Development 24 item
  11. Bravo Company MFG (BCM) 2 item
  12. Chisel Machining 1 item
  13. Elftmann Tactical 1 item
  14. F-1 Firearms 1 item
  15. Fortis MFG 14 item
  16. Forward Controls Design 36 item
  17. Geissele 6 item
  18. Griffin Armament 2 item
  19. HB Industries 5 item
  20. HERA ARMS 2 item
  21. Heresy Design 6 item
  22. Hiperfire 3 item
  23. JK Armament 10 item
  24. JMAC Customs 1 item
  25. JP Enterprises Inc 3 item
  26. James Madison Tactical (JMT) 1 item
  27. KNS Precision 8 item
  28. Kinetic Development Group 2 item
  29. Krebs Customs 5 item
  30. Lantac 3 item
  31. Mad Pig 2 item
  32. Magpul Industries 6 item
  33. NEMO Arms 2 item
  34. NIGHT FISION 1 item
  35. Neverwear Springs 1 item
  36. Next Level Armament 1 item
  37. Noveske 4 item
  38. Odin Works 1 item
  39. Patriot Ordnance Factory (POF) 2 item
  40. Pioneer CNC 2 item
  41. Precision Armament 1 item
  42. Primary Weapon Systems 1 item
  43. Q, LLC 1 item
  44. RS Regulate 1 item
  45. Radian Weapons 1 item
  46. Rainier Arms, LLC 10 item
  47. Rainier Industries 4 item
  48. Rise Armament 1 item
  49. Sharps Bros 1 item
  50. Sionics Weapon Systems 1 item
  51. Sons of Liberty Gun Works 2 item
  52. Sprinco (Tactical Springs) 4 item
  53. Springer Precision 1 item
  54. Strike Industries 10 item
  55. Timney Triggers 1 item
  56. Triggertech 1 item
  57. Troy Industries 1 item
  58. TruCalibre 4 item
  59. Tyrant Designs 2 item
  60. Underground Tactical 1 item
  61. V Seven Weapon Systems 31 item
  62. WMD Guns 12 item
  63. WOOX 1 item
  64. White Label Armory 2 item
Color
Caliber
  1. .22 Cal 2 item
  2. .223/5.56 1 item
  3. .30 Cal 3 item
  4. .308 2 item
  5. 300 Blackout 1 item
  6. 5.56 NATO 2 item
  7. 6.5 Grendel 1 item
  8. 6.8 SPC 1 item
  9. 7.62x51 1 item
  10. 9mm 7 item
Finish
  1. Anodize 5 item
  2. Black 3 item
  3. DLC 3 item
  4. NiB-X 4 item
  5. Nitromet 6 item
  6. Phosphate 1 item
Barrel Length
  1. 14.5" 1 item
  2. 16" 3 item
  3. 16.1" 2 item
  4. 16.3" 2 item
  5. 18" 5 item
Option
  1. 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
  2. 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
  3. AK-47/74 1 item
  4. AR-10 5 item
  5. AR-15 35 item
  6. Blue - Enhanced Power 1 item
  7. Bull's Eye 1 item
  8. CZ 5 item
  9. Dimpled 3 item
  10. FNH 1 item
  11. Green - Rifle Length Standard Power 1 item
  12. Green Laser 2 item
  13. Minimal 1 item
  14. Orange - Extra Extra Power 1 item
  15. Red - Extra Power 1 item
  16. Remington 700 Short Action BDL 1 item
  17. Serrated 5 item
  18. Springfield 1 item
  19. Vertical Lines 1 item
  20. White - Standard Power 1 item
  21. White/Red - Intermediate Power 1 item
  22. Yellow - Reduced Power 1 item
Gas Length
  1. Intermediate 5 item
  2. Mid 1 item
  3. Pistol 1 item
Size
9 Slot
Large
Medium
Mount
  1. KeyMod 1 item
  2. Picatinny 10 item
Stock Status
  1. In Stock 215 item
  2. Out of Stock 72 item
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