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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 1-16 of 803

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  1. Strike Industries AR15 Forward Assist
    Strike Industries AR15 Forward Assist
    $18.95
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  4. Fortis MFG Muzzle Brake 5.56
    Fortis MFG Muzzle Brake 5.56
    $75.95
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  9. Rainier Arms EMMR Mag Release
    Rainier Arms EMMR Mag Release
    $21.95
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  12. Magpul ACS Stock - MIL Spec
    Magpul ACS Stock - MIL Spec
    $90.20
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  13. Magpul AFG - Angled Forward Grip
    Magpul AFG - Angled Forward Grip
    $33.20
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  14. Magpul MOE AK Grip
    Magpul MOE AK Grip
    $19.90
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  15. Magpul MOE SL Carbine Stock Mil-Spec
    Magpul MOE SL Carbine Stock Mil-Spec
    $61.70
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  16. Magpul MOE SL-K Carbine Stock Mil-Spec (M-LOK)
    Magpul MOE SL-K Carbine Stock Mil-Spec (M-LOK)
    $42.70
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Barrel Length
  1. 3.1" 1 item
  2. 4" 1 item
  3. 4.5" 1 item
  4. 5.25" 1 item
  5. 5.5" 1 item
  6. 6" 1 item
  7. 7" 2 items
  8. 7.25" 1 item
  9. 7.5" 1 item
  10. 8" 1 item
  11. 8.5" 1 item
  12. 10.3" 1 item
  13. 16" 11 items
  14. 18" 9 items
Caliber
  1. .22 Cal 2 items
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  4. .30 Cal 5 items
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  6. 300 Blackout 1 item
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  10. 7.62mm 1 item
  11. 7.62x51 2 items
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  13. 9mm 23 items
Category
  1. Receiver Parts 10 items
  2. Parts & Kits 213 items
  3. Barrels 2 items
  4. Rifle Barrels 8 items
  5. Buffer Systems 31 items
  6. Trigger Parts 40 items
  7. Gas Systems 35 items
  8. Muzzle Devices 115 items
  9. Bolt Parts 16 items
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  11. Charging Handles 50 items
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  13. Stocks & Braces 65 items
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Configuration
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  14. Red 4 items
  15. Anodize 17 items
  16. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 6 items
  2. .750" 17 items
  3. .875" 5 items
  4. .936" 5 items
Gas System Length
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  11. Rifle +2 2 items
Height
  1. Absolute Co-Witness 1 item
  2. Low 1 item
  3. Medium 1 item
  4. High 1 item
Inside Diameter
  1. 1.35" 1 item
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. A3 Tactical 17 items
  2. Accu-Tac 2 items
  3. Advanced Armament Company (AAC) 3 items
  4. Aero Precision 4 items
  5. ALG Defense 3 items
  6. Andro Corp Industries 4 items
  7. Angstadt Arms 1 item
  8. Apex Tactical Specialties 4 items
  9. Arisaka 6 items
  10. Armaspec 3 items
  11. Arms Republic 6 items
  12. Ascalon Arms 7 items
  13. B5 Systems 8 items
  14. Battle Arms Development 9 items
  15. Black River MFG 1 item
  16. Blitzkrieg Components 14 items
  17. Bravo Company MFG (BCM) 38 items
  18. Breek Arms 1 item
  19. Brigand Arms 1 item
  20. Centurion Arms 4 items
  21. Chisel Machining 1 item
  22. Cobalt Kinetics 1 item
  23. Cross Machine Tool (CMT) 6 items
  24. Daniel Defense 3 items
  25. Dead Air Armament 5 items
  26. Die Free Co 1 item
  27. Drew Meyers Defense 4 items
  28. Driven Arms Co. 14 items
  29. Elftmann Tactical 1 item
  30. Emissary Development 4 items
  31. Ergo Grips 1 item
  32. F-1 Firearms 2 items
  33. Faxon Firearms 4 items
  34. Flatline Fiber Co 1 item
  35. Fortis MFG 35 items
  36. Forward Controls Design 70 items
  37. Gear Head Works 1 item
  38. Geissele 5 items
  39. Grey Ghost Precision 1 item
  40. Griffin Armament 15 items
  41. Half Cocked Arms (HCA) 1 item
  42. HB Industries 18 items
  43. HERA ARMS 10 items
  44. Heresy Design 2 items
  45. Hiperfire 8 items
  46. HUXWRX 1 item
  47. Icarus Precision 2 items
  48. James Madison Tactical (JMT) 2 items
  49. JK Armament 12 items
  50. JL Billet 1 item
  51. JMAC Customs 21 items
  52. JP Enterprises Inc 9 items
  53. Kinetic Development Group 1 item
  54. Knight’s Armament Company (KAC) 2 items
  55. KNS Precision 10 items
  56. Kaw Valley Precision 2 items
  57. Kratos Design Group 3 items
  58. Krebs Customs 5 items
  59. Lancer Systems 1 item
  60. Lantac 2 items
  61. Leitner-Wise 1 item
  62. LUTH-AR 2 items
  63. Mad Pig 5 items
  64. Magpul Industries 57 items
  65. Maxim Defense 2 items
  66. Midwest Industries 1 item
  67. Mission First Tactical 3 items
  68. Multitasker Tools 1 item
  69. NEMO Arms 3 items
  70. Neverwear Springs 1 item
  71. Next Level Armament 17 items
  72. NIGHT FISION 1 item
  73. Noveske 6 items
  74. Odin Works 1 item
  75. Patriot Ordnance Factory (POF) 5 items
  76. Precision Armament 5 items
  77. Primary Weapon Systems 3 items
  78. Q, LLC 5 items
  79. R&D Precision 1 item
  80. Radian Weapons 6 items
  81. Rainier Arms, LLC 24 items
  82. Rainier Industries 14 items
  83. Rehv Arms 2 items
  84. Reptilia Corp 5 items
  85. Riflespeed 1 item
  86. Rise Armament 4 items
  87. SB Tactical 5 items
  88. Seekins Precision 2 items
  89. Shooting Innovations 2 items
  90. Sig Sauer 1 item
  91. Silencerco 4 items
  92. Sionics Weapon Systems 1 item
  93. Sons of Liberty Gun Works 7 items
  94. Spinta Precision 2 items
  95. Sprinco (Tactical Springs) 5 items
  96. Stag Arms 2 items
  97. Stern Defense 1 item
  98. Strike Industries 33 items
  99. Superlative Arms 6 items
  100. Tactical Edge Arms 1 item
  101. Tango Down 1 item
  102. Taran Tactical Innovations 1 item
  103. Timney Triggers 1 item
  104. Tippmann Arms 1 item
  105. Triggertech 1 item
  106. TruCalibre 6 items
  107. True North Concepts 8 items
  108. Tyrant Designs 9 items
  109. Underground Tactical 1 item
  110. Unity Tactical 1 item
  111. V Seven Weapon Systems 31 items
  112. VLTOR 10 items
  113. White Label Armory 2 items
  114. WMD Guns 11 items
Model
  1. CZ Bren 2 items
  2. CZ Scorpion 15 items
  3. FNH 509 1 item
  4. Sig MCX 1 item
  5. Sig MPX 1 item
  6. Springfield Hellcat 1 item
Mount
  1. KeyMod 10 items
  2. M-LOK 52 items
  3. Other 1 item
  4. Picatinny 45 items
Option
  1. AK-47/74 8 items
  2. AR-9 2 items
  3. AR-10 17 items
  4. AR-15 76 items
  5. Standard 1 item
  6. 4.720" 2 items
  7. 6.295" 2 items
  8. 7.870" 2 items
  9. 9.445" 2 items
  10. Bull's Eye 1 item
  11. Vertical Lines 1 item
  12. Minimal 1 item
  13. White - Standard Power 1 item
  14. Blue - Enhanced Power 1 item
  15. Red - Extra Power 1 item
  16. Yellow - Reduced Power 1 item
  17. White/Red - Intermediate Power 1 item
  18. Green - Rifle Length Standard Power 1 item
  19. Long 1 item
  20. 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
  21. 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
  22. 9mm 1 item
  23. CZ 12 items
  24. FNH 1 item
  25. Heckler & Koch 1 item
  26. Springfield 1 item
  27. Holed 1 item
  28. Profile 1 item
  29. Small Lever 1 item
  30. Green Laser 2 items
  31. Adjustable 6 items
  32. Non-Adjustable 18 items
  33. Dimpled 3 items
  34. Serrated 5 items
Platform
  1. AR-9 1 item
  2. AR-10/LR308 6 items
  3. AR-15 37 items
  4. AK47/74 4 items
  5. CZ-USA 15 items
  6. FNH 1 item
  7. H&K 3 items
  8. Sig Sauer 2 items
  9. Springfield 1 item
Price
  1. $0.00 - $9.99 67 items
  2. $10.00 - $19.99 111 items
  3. $20.00 - $29.99 98 items
  4. $30.00 - $39.99 98 items
  5. $40.00 - $49.99 83 items
  6. $50.00 - $59.99 80 items
  7. $60.00 - $69.99 60 items
  8. $70.00 - $79.99 57 items
  9. $80.00 - $89.99 71 items
  10. $90.00 and above 78 items
Product Type
  1. Accessory 5 items
  2. Adapter Plate 1 item
  3. Angled Grip 21 items
  4. Anti Walk Pins 2 items
  5. AR-10 / LR 308 Charging Handle 3 items
  6. AR-10 Handguard 1 item
  7. AR-15 Assembled Upper Receiver 1 item
  8. AR-15 Barrel 2 items
  9. AR-15 Charging Handle 20 items
  10. AR-15 Handguard 1 item
  11. AR-15 Stripped Lower Receiver 3 items
  12. AR-15 Stripped Upper Receiver 5 items
  13. AR-9 Upper Receiver 1 item
  14. Barrel 8 items
  15. Barrel Adapter 2 items
  16. Barrel Nut 4 items
  17. Blast Shield 1 item
  18. Bolt Catch 20 items
  19. Brace 5 items
  20. Brace Strap 1 item
  21. Buffer 18 items
  22. Buffer Kit 4 items
  23. Buffer Spring 8 items
  24. Buffer Tube 8 items
  25. Cam Pin 6 items
  26. Castle Nut 5 items
  27. Castle Nut / End Plate 6 items
  28. Cable Clip 1 item
  29. Charging Handle 31 items
  30. Cheek Riser 4 items
  31. Compensator 35 items
  32. Crush Washer 3 items
  33. Dust Cover 13 items
  34. End Cap 7 items
  35. End Plate 14 items
  36. Failure Resistant Extractor 2 items
  37. Finger Stop 2 items
  38. Firing Pin 3 items
  39. Flash Hider 28 items
  40. Forearm Accesory 16 items
  41. Forward Assist 11 items
  42. Forward Assist Spring 1 item
  43. Front Sight 2 items
  44. Gas Block 29 items
  45. Gas Rings 3 items
  46. Gas Tube 4 items
  47. Grip Accessory 9 items
  48. Grip Module 1 item
  49. Grip Screw 1 item
  50. Handguard 4 items
  51. Handguard Adaptor 2 items
  52. Handstop 33 items
  53. Key Screw 1 item
  54. Lower Parts Kit 13 items
  55. Magazine 1 item
  56. Magazine Button 2 items
  57. Magazine Catch 9 items
  58. Magazine Release 17 items
  59. Magazine Spring 1 item
  60. Magwell 4 items
  61. Muzzle Brake 37 items
  62. Muzzle Device Accessory 9 items
  63. Parts Kit 7 items
  64. Pistol Grip 50 items
  65. Pistol Part 1 item
  66. Port Door 4 items
  67. Port Door Rod 3 items
  68. Port Door Spring 1 item
  69. Rail Adapter 5 items
  70. Rail Cover 2 items
  71. Rail Panel 14 items
  72. Rail Section 1 item
  73. Recoil Spring 1 item
  74. Retainer Pin 5 items
  75. Roll Pin 2 items
  76. Safety Selector 38 items
  77. Shim Set 4 items
  78. Sight Post 14 items
  79. Spring 8 items
  80. Stock 28 items
  81. Stock Accessory 9 items
  82. Stock Adapter 16 items
  83. Suppressor Accessory 1 item
  84. Take Down / Pivot Pins 17 items
  85. Trigger 19 items
  86. Trigger / Hammer Pins 3 items
  87. Trigger Guard 14 items
  88. Upper Parts Kit 2 items
  89. Vertical Grip 23 items
Rail Length
  1. 7" 1 item
  2. 7.3" 1 item
  3. 7.8" 1 item
  4. 9.25" 1 item
  5. 10" 8 items
  6. 12" 13 items
  7. 12.6" 2 items
  8. 14" 1 item
  9. 15" 1 item
Size
  1. 3" 1 item
  2. Small 1 item
  3. Medium 4 items
  4. Large 4 items
  5. X-Large 2 items
  6. 6" 1 item
  7. 3 Slot 1 item
  8. 5 Slot 3 items
  9. 9 Slot 16 items
  10. 1/2" 1 item
  11. 5/8" 1 item
Thread Pitch
  1. 1.375-24 1 item
  2. 1/2x28 76 items
  3. 1/2x32 4 items
  4. 1/2x36 8 items
  5. 3/4x24 1 item
  6. 5/8x24 30 items
  7. M13.5x1 LH 7 items
  8. M14x1 LH 2 items
  9. M18x1.5 2 items
Threaded
  1. Yes 22 items
Twist Rate
  1. 1:10 7 items
Stock Status
  1. In stock 803 items Remove This Item
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