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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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  12. Blitzkrieg Components Magpul MBUS PRO Flat Front Sight Post
    Blitzkrieg Components Magpul MBUS PRO Flat Front Sight Post
    $18.95 - $22.75
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  14. Blitzkrieg Components AR-15 Spike Front Sight Post
    Blitzkrieg Components AR-15 Spike Front Sight Post
    $20.85 - $22.75
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  15. True North Concepts M-LOK Gripstop Standard
    True North Concepts M-LOK Gripstop Standard
    $48.00
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  16. True North Concepts M-LOK Gripstop K
    True North Concepts M-LOK Gripstop K
    $48.00
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Items 49-64 of 782

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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. 16" 11 items
  13. 18" 8 items
Caliber
  1. .22 Cal 2 items
  2. .223/5.56 8 items
  3. .223 Rem 1 item
  4. .30 Cal 6 items
  5. .308 2 items
  6. 300 Blackout 1 item
  7. 5.56X45 1 item
  8. 5.56 NATO 11 items
  9. 5.56mm 5 items
  10. 7.62mm 1 item
  11. 7.62x51 2 items
  12. 8.6 Blackout 1 item
  13. 9mm 22 items
Category
  1. Receiver Parts 10 items
  2. Parts & Kits 210 items
  3. Rifle Barrels 8 items
  4. Buffer Systems 27 items
  5. Trigger Parts 37 items
  6. Gas Systems 33 items
  7. Muzzle Devices 116 items
  8. Bolt Parts 17 items
  9. Grips 132 items
  10. Charging Handles 52 items
  11. Rifle Handguards 45 items
  12. Stocks & Braces 63 items
  13. MILSPEC Parts 43 items
Color
Configuration
  1. 90 Degree 1 item
  2. AR-10 2 items
  3. AR-15 13 items
  4. Curved 1 item
  5. Flat 1 item
  6. Gen 3 1 item
  7. Left 1 item
  8. Left Hand 1 item
  9. M-LOK 6 items
  10. Rifle 1 item
  11. Right Hand 1 item
  12. .625 DIA 5 items
  13. .750 DIA 6 items
  14. .800 DIA 2 items
  15. .875 DIA 3 items
  16. .936 DIA 3 items
  17. Large Latch 1 item
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  19. Small Latch 1 item
Finish
  1. Bead Blast Stainless Steel 1 item
  2. Black 10 items
  3. Blue 1 item
  4. DLC 3 items
  5. FDE 2 items
  6. Gold 1 item
  7. Grey 1 item
  8. Melonite 2 items
  9. NiB-X 3 items
  10. Nickel Boron 2 items
  11. Nitride 6 items
  12. Nitromet 6 items
  13. Phosphate 1 item
  14. Red 2 items
  15. Anodize 17 items
  16. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .625" 6 items
  2. .750" 16 items
  3. .875" 5 items
  4. .936" 5 items
Gas Length
  1. Pistol -1 2 items
  2. Pistol 8 items
  3. Carbine 4 items
  4. Micro 1 item
  5. Mid 12 items
  6. Intermediate 11 items
  7. Patrol 1 item
  8. Rifle 3 items
  9. Rifle +1 2 items
  10. 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
Is Firearms?
  1. No 782 items
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. A3 Tactical 14 items
  2. Accu-Tac 2 items
  3. Advanced Armament Company (AAC) 4 items
  4. Aero Precision 4 items
  5. Airborne Arms 1 item
  6. ALG Defense 3 items
  7. Andro Corp Industries 4 items
  8. Angstadt Arms 1 item
  9. Apex Tactical Specialties 4 items
  10. Arisaka 6 items
  11. Armaspec 4 items
  12. Arms Republic 7 items
  13. Ascalon Arms 7 items
  14. Brügger & Thomet (B&T) 1 item
  15. B5 Systems 7 items
  16. Battle Arms Development 10 items
  17. Black River MFG 1 item
  18. Blitzkrieg Components 10 items
  19. Bravo Company MFG (BCM) 34 items
  20. Breek Arms 1 item
  21. Brigand Arms 1 item
  22. Centurion Arms 3 items
  23. Chisel Machining 1 item
  24. Cobalt Kinetics 1 item
  25. Cross Machine Tool (CMT) 6 items
  26. Daniel Defense 3 items
  27. Dead Air Armament 5 items
  28. Die Free Co 1 item
  29. Drew Meyers Defense 4 items
  30. Driven Arms Co. 12 items
  31. Elftmann Tactical 1 item
  32. Emissary Development 6 items
  33. Ergo Grips 1 item
  34. F-1 Firearms 2 items
  35. Faxon Firearms 2 items
  36. Flatline Fiber Co 1 item
  37. Fortis MFG 34 items
  38. Forward Controls Design 68 items
  39. Gear Head Works 1 item
  40. Geissele 4 items
  41. Grey Ghost Precision 1 item
  42. Griffin Armament 14 items
  43. Half Cocked Arms (HCA) 1 item
  44. HB Industries 12 items
  45. HERA ARMS 8 items
  46. Heresy Design 2 items
  47. Hiperfire 7 items
  48. HUXWRX 1 item
  49. Icarus Precision 2 items
  50. James Madison Tactical (JMT) 2 items
  51. JK Armament 12 items
  52. JL Billet 1 item
  53. JMAC Customs 22 items
  54. JP Enterprises Inc 6 items
  55. Kinetic Development Group 1 item
  56. Knight’s Armament Company (KAC) 1 item
  57. KNS Precision 8 items
  58. Kaw Valley Precision 2 items
  59. Kratos Design Group 3 items
  60. Krebs Customs 5 items
  61. Lancer Systems 1 item
  62. Lantac 2 items
  63. Leitner-Wise 1 item
  64. LUTH-AR 2 items
  65. Mad Pig 5 items
  66. Mag-Pod 1 item
  67. Magpul Industries 59 items
  68. Maxim Defense 2 items
  69. Midwest Industries 1 item
  70. Mission First Tactical 3 items
  71. Multitasker Tools 1 item
  72. NEMO Arms 3 items
  73. Neverwear Springs 1 item
  74. Next Level Armament 14 items
  75. NIGHT FISION 1 item
  76. Noveske 7 items
  77. Odin Works 1 item
  78. Patriot Ordnance Factory (POF) 4 items
  79. Precision Armament 4 items
  80. Primary Weapon Systems 3 items
  81. Q, LLC 5 items
  82. R&D Precision 1 item
  83. Radian Weapons 8 items
  84. Rainier Arms, LLC 23 items
  85. Rainier Industries 13 items
  86. Rehv Arms 2 items
  87. Reptilia Corp 5 items
  88. Riflespeed 1 item
  89. Rise Armament 4 items
  90. RS Regulate 1 item
  91. SB Tactical 4 items
  92. Seekins Precision 2 items
  93. Shooting Innovations 1 item
  94. Sig Sauer 2 items
  95. Silencerco 4 items
  96. Sionics Weapon Systems 1 item
  97. Sons of Liberty Gun Works 7 items
  98. Spinta Precision 1 item
  99. Sprinco (Tactical Springs) 7 items
  100. Stag Arms 2 items
  101. Strike Industries 33 items
  102. Superlative Arms 6 items
  103. Tactical Edge Arms 1 item
  104. Tango Down 1 item
  105. Taran Tactical Innovations 1 item
  106. Timney Triggers 1 item
  107. Tippmann Arms 1 item
  108. Triggertech 1 item
  109. TruCalibre 6 items
  110. True North Concepts 9 items
  111. Tyrant Designs 8 items
  112. Underground Tactical 1 item
  113. Unity Tactical 1 item
  114. V Seven Weapon Systems 39 items
  115. VLTOR 10 items
  116. White Label Armory 2 items
  117. WMD Guns 11 items
Model
  1. CZ Bren 3 items
  2. CZ Scorpion 13 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 54 items
  3. Other 1 item
  4. Picatinny 42 items
Option
  1. AK-47/74 7 items
  2. AR-9 2 items
  3. AR-10 17 items
  4. AR-15 70 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. Orange - Extra Extra Power 1 item
  17. Yellow - Reduced Power 1 item
  18. White/Red - Intermediate Power 1 item
  19. Green - Rifle Length Standard Power 1 item
  20. Long 1 item
  21. 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
  22. 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
  23. 9mm 1 item
  24. CZ 8 items
  25. FNH 1 item
  26. Heckler & Koch 1 item
  27. Springfield 1 item
  28. Holed 1 item
  29. Profile 1 item
  30. Small Lever 1 item
  31. Green Laser 2 items
  32. Adjustable 5 items
  33. Non-Adjustable 17 items
  34. Dimpled 3 items
  35. Serrated 4 items
Platform
  1. AR-9 1 item
  2. AR-10 6 items
  3. AR-15 32 items
  4. AK47/74 4 items
  5. CZ-USA 13 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 - $19.99 106 items
  3. $20.00 - $29.99 95 items
  4. $30.00 - $39.99 98 items
  5. $40.00 - $49.99 79 items
  6. $50.00 - $59.99 71 items
  7. $60.00 - $69.99 59 items
  8. $70.00 - $79.99 62 items
  9. $80.00 - $89.99 67 items
  10. $90.00 and above 78 items
Product Type
  1. Accessory 4 items
  2. Adapter Plate 1 item
  3. Angled Grip 18 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 Charging Handle 23 items
  9. AR-15 Handguard 1 item
  10. AR-15 Stripped Lower Receiver 3 items
  11. AR-15 Stripped Upper Receiver 5 items
  12. AR-9 Upper Receiver 1 item
  13. Barrel 8 items
  14. Barrel Adapter 2 items
  15. Barrel Nut 4 items
  16. Blast Shield 1 item
  17. Bolt Catch 18 items
  18. Brace 4 items
  19. Brace Strap 1 item
  20. Buffer 14 items
  21. Buffer Kit 3 items
  22. Buffer Spring 8 items
  23. Buffer Tube 9 items
  24. Cam Pin 6 items
  25. Castle Nut 5 items
  26. Castle Nut / End Plate 8 items
  27. Cable Clip 1 item
  28. Charging Handle 30 items
  29. Cheek Riser 4 items
  30. Compensator 35 items
  31. Crush Washer 3 items
  32. Dust Cover 13 items
  33. End Cap 9 items
  34. End Plate 11 items
  35. Failure Resistant Extractor 2 items
  36. Finger Stop 2 items
  37. Firing Pin 4 items
  38. Flash Hider 30 items
  39. Forearm Accesory 16 items
  40. Forward Assist 11 items
  41. Forward Assist Spring 1 item
  42. Front Sight 2 items
  43. Gas Block 27 items
  44. Gas Rings 3 items
  45. Gas Tube 4 items
  46. Grip Accessory 10 items
  47. Grip Module 1 item
  48. Grip Screw 1 item
  49. Handguard 5 items
  50. Handguard Adaptor 2 items
  51. Handstop 32 items
  52. Key Screw 1 item
  53. Lower Parts Kit 13 items
  54. Magazine 1 item
  55. Magazine Button 2 items
  56. Magazine Catch 9 items
  57. Magazine Release 16 items
  58. Magazine Spring 1 item
  59. Magwell 4 items
  60. Muzzle Brake 36 items
  61. Muzzle Device Accessory 9 items
  62. Parts Kit 8 items
  63. Pistol Grip 49 items
  64. Pistol Part 1 item
  65. Port Door 4 items
  66. Port Door Rod 6 items
  67. Port Door Spring 1 item
  68. Rail Adapter 5 items
  69. Rail Cover 2 items
  70. Rail Panel 13 items
  71. Rail Section 1 item
  72. Recoil Spring 1 item
  73. Retainer Pin 5 items
  74. Roll Pin 2 items
  75. Safety Selector 34 items
  76. Shim Set 4 items
  77. Sight Post 10 items
  78. Sling Mount 1 item
  79. Spring 8 items
  80. Stock 28 items
  81. Stock Accessory 8 items
  82. Stock Adapter 15 items
  83. Suppressor Accessory 1 item
  84. Take Down / Pivot Pins 17 items
  85. Trigger 17 items
  86. Trigger / Hammer Pins 3 items
  87. Trigger Guard 15 items
  88. Upper Parts Kit 2 items
  89. Vertical Grip 24 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" 11 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 15 items
  10. 1/2" 1 item
  11. 5/8" 1 item
Thread Pitch
  1. 1.375-24 1 item
  2. 1/2x28 74 items
  3. 1/2x32 4 items
  4. 1/2x36 9 items
  5. 3/4x24 1 item
  6. 5/8x24 31 items
  7. M13.5x1 LH 7 items
  8. M14x1 LH 2 items
  9. M18x1.5 2 items
Threaded
  1. Yes 23 items
Twist Rate
  1. 1:10 5 items
Stock Status
  1. In stock 782 items Remove This Item
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